Hey there Ruby.
Yes, you can say "you too," but that's usually if you're good friends with the person, like a good friend or a best friend.
A couple of other responses you can do are:
"Thanks/thank you, you too." This is a great thing to say to anyone, even if you don't know them that well.
"And the same to you" is a more formal version of the above examples, but I prefer it because you literally saying "I am wishing you luck as well."
Hope this helps!