Can he pray Witr twice in one night if he prays after the imam?

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Check below answers in case you are looking for other related questions:
Is it permissible to pray naafil after Witr?
He is praying as an imam and he wants to delay Witr

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Related Answers:
Praying Taraaweeh at home/putting cream on the body when fasting
Reciting the opening du’aa’ in taraaweeh prayers
Is the du’aa’ of Witr obligatory, and what should a person say if he cannot memorize it?
Is it permissible to pray naafil after Witr?
He is praying as an imam and he wants to delay Witr

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