The 2015 Sun Belt Conference football season was the 15th college football season for the Sun Belt Conference.During the 2015 season, eleven schools competed in Sun Belt football: Appalachian State, Arkansas State, Georgia State, Georgia Southern, Idaho, Louisiana–Lafayette, Louisiana–Monroe, New Mexico State, South Alabama, Texas State and Troy. On September 1, 2015, it was announced that Coastal Carolina will join the Sun Belt Conference. They will compete in SBC football starting in 2017.