Starting at 17th level, you can strike with deadly speed. If you take the Attack action on your turn, you can make one additional attack as a bonus action. This attack can benefit from your Sneak Attack even if you have already used it this turn, but you can't use your Sneak Attack against the same target more than once in a turn.
And Sneak Attack states:
Beginning at 1st level, you know how to strike subtly and exploit a foe’s distraction. 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 [...]
I'm wondering what happens in the following scenario:
- You take the Attack action (fully) but never proc Sneak Attack
- You use your bonus action from Sudden Strike and proc Sneak Attack
- You make another attack (such as through an opportunity attack or Action Surge)
Can your attack in step 3 apply Sneak Attack even though you've already applied it during that turn using Sudden Strike?