Yes, you can. The rules in the Player’s Handbook and SRD state that:
Once per turn, you can deal an extra 1d6 damage to one creature you hit with an attack if you have advantage on the attack roll.
Player’s Handbook
The important thing here is that this is once per turn, not once per round. If you are able to land an opportunity attack on an enemy’s turn, then this is a separate turn and means that sneak attack can be used again.
Of course, this still relies on meeting the requirements for an opportunity attack and the other requirements for sneak attack are still being met.
Technically, this means you could also use sneak attack in other rare moments when you get an attack on someone else’s turn.
This ruling is clarified in Wizards of the Coast’s official sage advice compendium.
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