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You certainly can sell the property without obtaining your wife's signature, provided the buyer is happy to evict her after completion. I must say, the buyer's Solicitor is very unlikely to advise him to proceed on this basis!
Please note that if your buyer is having a Mortgage to finance the purchase, his Solicitor won't be able to proceed until your wife has vacated.
The only other issue that may put a halt on matters is if your wife registers a Home Rights Notice on the property,which is basically confirming that she has a right to remain in th eproperty until such time as any divorce is finalised.
I hope this assists and sets out the legal position.