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You cannot counter a spell through wall of force

Counterspell has a casting time of

Casting time: 1 Reaction, which you take when you see a creature within 60 feet of you casting a spell

That means you can only cast it when you see the creature. Wall of force is invisible, so you can see the sorcerer casting the spell, so assuming the wizard is within 60 feet, all conditions for casting counterspell are fulfilled.

However, there is a general rule that A Clear Path to the Target (p. 204, PHB) is needed for spells. It that says:

To target something, you must have a clear path to it, so it can’t be behind total cover.

Because of this, you normally cannot cast spells through wall of force, as it provides total cover and we lack a clear path to the target. Teleportation is an exception, so the sorcerer could teleport out.

So what are you targeting, when you cast counterspell? The spell? The caster? Something else? Targeting of spells is not that well defined, but the Targets rule (again, p. 204, PHB) tells us

A typical spell requires you to pick one or more targets to be affected by the spell’s magic. A spell's description tells you whether the spell targets creatures, objects, or a point of origin for an area of effect [...] Typically, a point of origin is a point in space, but some spells have an area whose origin is a creature or an object.

Your available types of targets are creatures, objects of points in space. The casting of the spell is neither of those. Counterspell's description says

You attempt to interrupt a creature in the process of casting a spell.

The only possible target therefore is the creature that is in the process of casting the spell. That creature however is behind total cover, so you cannot target it with counterpell. Because of that you cannot counter dimension door in this scenario, and the sorcerer will escape.

This is confirmed by the Sage Advice Compendium (thanks to @Eddiemage for pointing this out) which has an explicit question on it:

Does counterspell target the caster or the spell you’re trying to counter? Counterspell targets the other spellcaster.

You cannot counter a spell through wall of force

Counterspell has a casting time of

Casting time: 1 Reaction, which you take when you see a creature within 60 feet of you casting a spell

That means you can only cast it when you see the creature. Wall of force is invisible, so you can see the sorcerer casting the spell, so assuming the wizard is within 60 feet, all conditions for casting counterspell are fulfilled.

However, there is a general rule that A Clear Path to the Target (p. 204, PHB) is needed for spells. It that says:

To target something, you must have a clear path to it, so it can’t be behind total cover.

Because of this, you normally cannot cast spells through wall of force, as it provides total cover and we lack a clear path to the target. Teleportation is an exception, so the sorcerer could teleport out.

So what are you targeting, when you cast counterspell? The spell? The caster? Something else? Targeting of spells is not that well defined, but the Targets rule (again, p. 204, PHB) tells us

A typical spell requires you to pick one or more targets to be affected by the spell’s magic. A spell's description tells you whether the spell targets creatures, objects, or a point of origin for an area of effect [...] Typically, a point of origin is a point in space, but some spells have an area whose origin is a creature or an object.

Your available types of targets are creatures, objects of points in space. The casting of the spell is neither of those. Counterspell's description says

You attempt to interrupt a creature in the process of casting a spell.

The only possible target therefore is the creature that is in the process of casting the spell. That creature however is behind total cover, so you cannot target it with counterpell. Because of that you cannot counter dimension door in this scenario, and the sorcerer will escape.

This is confirmed by the Sage Advice Compendium (thanks to @Eddymage for pointing this out) which has an explicit question on it:

Does counterspell target the caster or the spell you’re trying to counter? Counterspell targets the other spellcaster.

You cannot counter a spell through wall of force

Counterspell has a casting time of

Casting time: 1 Reaction, which you take when you see a creature within 60 feet of you casting a spell

That means you can only cast it when you see the creature. Wall of force is invisible, so you can see the sorcerer casting the spell, so assuming the wizard is within 60 feet, all conditions for casting counterspell are fulfilled.

However, there is a general rule that A Clear Path to the Target (p. 204, PHB) is needed for spells. It that says:

To target something, you must have a clear path to it, so it can’t be behind total cover.

Because of this, you normally cannot cast spells through wall of force, as it provides total cover and we lack a clear path to the target. Teleportation is an exception, so the sorcerer could teleport out.

So what are you targeting, when you cast counterspell? The spell? The caster? Something else? Targeting of spells is not that well defined, but the Targets rule (again, p. 204, PHB) tells us

A typical spell requires you to pick one or more targets to be affected by the spell’s magic. A spell's description tells you whether the spell targets creatures, objects, or a point of origin for an area of effect [...] Typically, a point of origin is a point in space, but some spells have an area whose origin is a creature or an object.

Your available types of targets are creatures, objects of points in space. The casting of the spell is neither of those. Counterspell's description says

You attempt to interrupt a creature in the process of casting a spell.

The only possible target therefore is the creature that is in the process of casting the spell. That creature however is behind total cover, so you cannot target it with counterpell. Because of that you cannot counter dimension door in this scenario, and the sorcerer will escape.

You cannot counter a spell through wall of force

Counterspell has a casting time of

Casting time: 1 Reaction, which you take when you see a creature within 60 feet of you casting a spell

That means you can only cast it when you see the creature. Wall of force is invisible, so you can see the sorcerer casting the spell, so assuming the wizard is within 60 feet, all conditions for casting counterspell are fulfilled.

However, there is a general rule that A Clear Path to the Target (p. 204, PHB) is needed for spells. It that says:

To target something, you must have a clear path to it, so it can’t be behind total cover.

Because of this, you normally cannot cast spells through wall of force, as it provides total cover and we lack a clear path to the target. Teleportation is an exception, so the sorcerer could teleport out.

So what are you targeting, when you cast counterspell? The spell? The caster? Something else? Targeting of spells is not that well defined, but the Targets rule (again, p. 204, PHB) tells us

A typical spell requires you to pick one or more targets to be affected by the spell’s magic. A spell's description tells you whether the spell targets creatures, objects, or a point of origin for an area of effect [...] Typically, a point of origin is a point in space, but some spells have an area whose origin is a creature or an object.

Your available types of targets are creatures, objects of points in space. The casting of the spell is neither of those. Counterspell's description says

You attempt to interrupt a creature in the process of casting a spell.

The only possible target therefore is the creature that is in the process of casting the spell. That creature however is behind total cover, so you cannot target it with counterpell. Because of that you cannot counter dimension door in this scenario, and the sorcerer will escape.

This is confirmed by the Sage Advice Compendium (thanks to @Eddiemage for pointing this out) which has an explicit question on it:

Does counterspell target the caster or the spell you’re trying to counter? Counterspell targets the other spellcaster.

You cannot counter a spell through wall of force

Counterspell has a casting time of

Catsting time: 1 Reaction, which you take when you see a creature within 60 feet of you casting a spell

That means you can only cast it when you see the creature. Wall of force is invisible, so you can see the sorcerer casting the spell, so assuming the wizard is within 60 feet, all conditions for casting counterspell are fulfilled.

However, there is a general rule that A Clear Path to the Target (p. 204, PHB) is needed for spells. It that says:

To target something, you must have a clear path to it, so it can’t be behind total cover.

Because of this, you normally cannot cast spells through wall of force, as it provides total cover and we lack a clear path to the target. Teleportation is an exception, so the sorcerer could teleport out.

So what are you targeting, when you cast counterspell? The spell? The caster? Something else? Targeting of spells is not that well defined, but the Targets rule (again, p. 204, PHB) tells us

A typical spell requires you to pick one or more targets to be affected by the spell’s magic. A spell's description tells you whether the spell targets creatures, objects, or a point of origin for an area of effect [...] Typically, a point of origin is a point in space, but some spells have an area whose origin is a creature or an object.

Your available types of targets are creatures, objects of points in space. The casting of the spell is neither of those. Counterspell's description says

You attempt to interrupt a creature in the process of casting a spell.

The only possible target therefore is the creature that is in the process of casting the spell. That creature however is behind total cover, so you cannot target it with counterpell. Because of that you cannot counter dimension door in this scenario, and the sorcerer will escape.

You cannot counter a spell through wall of force

Counterspell has a casting time of

Casting time: 1 Reaction, which you take when you see a creature within 60 feet of you casting a spell

That means you can only cast it when you see the creature. Wall of force is invisible, so you can see the sorcerer casting the spell, so assuming the wizard is within 60 feet, all conditions for casting counterspell are fulfilled.

However, there is a general rule that A Clear Path to the Target (p. 204, PHB) is needed for spells. It that says:

To target something, you must have a clear path to it, so it can’t be behind total cover.

Because of this, you normally cannot cast spells through wall of force, as it provides total cover and we lack a clear path to the target. Teleportation is an exception, so the sorcerer could teleport out.

So what are you targeting, when you cast counterspell? The spell? The caster? Something else? Targeting of spells is not that well defined, but the Targets rule (again, p. 204, PHB) tells us

A typical spell requires you to pick one or more targets to be affected by the spell’s magic. A spell's description tells you whether the spell targets creatures, objects, or a point of origin for an area of effect [...] Typically, a point of origin is a point in space, but some spells have an area whose origin is a creature or an object.

Your available types of targets are creatures, objects of points in space. The casting of the spell is neither of those. Counterspell's description says

You attempt to interrupt a creature in the process of casting a spell.

The only possible target therefore is the creature that is in the process of casting the spell. That creature however is behind total cover, so you cannot target it with counterpell. Because of that you cannot counter dimension door in this scenario, and the sorcerer will escape.