Will sarcoidosis affect my sex life?

Not likely. If your sarcoid is flared up causing lung impairment you may have difficulty exerting yourself. Other than shortness of breath or fatigue i would not expect much impact.
Sarcoidosis. Sarcoidosis is a common disease that can affect several parts of the body in which inflammation occurs in the lymph nodes, lungs, liver, eyes, skin, or other body tissues. It is possible that it could affect your sex life, but it would be a very rare occurrence.