I get aroused by sneezes
Why does sneezing arouse you?
It just something about the sound.
While it is strange it is okay to get aroused by different things. Just be careful acting out on those desires in public.  That could get you in trouble!
I am not sure if I can control myself.
If you find you're unable to control your behavior it may be worth speaking to a professional about it.  They can help you deal with compulsions and urges and get them under control.