I've went to work before with a slight sinus infection but on the second day the sinus infection started getting worse and I had to go home around the lunch hour.
If you're feeling okay then you could go ahead and go to work but then if you start feeling worse then you should let your boss know that you need to go home and need some time off.
However it would be in your best interest for you to stay home for at least 48 hours to start getting rid of the sinus infection.
The bacteria of a sinus infection is not contagious but you might also have something else along with the infection that could spread to other people at your job so it would be best to just call in sick if possible.