Well, yes, sinusitis can just cause sore eyes in some degree. And generally speaking, sinusitis is a kind of infection which will have effects on eyes. For example, it can cause your eyes bloodshot, by increasing the pressure inside the blood vessels. Also, sometimes, sinusitis can just cause bruised eyes, sore eyes, and puffy eyes, red and itchy eyes and so on. At that moment, it can be dangerous for your eyes. So just pay more attention to it.
All right, looks like you are worried about your eye health. As a matter of fact, it is true that sinus infection will affect other parts of your body, such as your head and your eyes, for they are closely interconnected by the same nervous system. So it is true sore eyes might be resulted from sinus infection. I strongly recommend that you try to get some medical treatment and avoid violating some suggestions posed by the doctor.