FlightSafety regularly has Ground and Simulator Instructor positions open at some of their Centers; check their website for posted openings. However, these positions are often "filled" either before or just after they are posted, and may not last on the website very long at all. My suggestion is to personally visit any FSI Learning Center that you might be near, and ask to speak with either the Director of Training or the Center Manager. Say hello, introduce yourself, drop off a resume. If you are not physically near a Learning Center, try a phone call, and ask to speak to either the DOT or CM. The personal touch will put you ahead of those that merely apply on line.