The Mountaineers (10-2, 7-1) are the second Sun Belt Conference team with 10 regular season wins, and advance to their first-ever bowl game.
Appalachian State had a 24-7 halftime lead. Gerald Everett ran for two touchdowns and Aleem Sunanon kicked two field goals to give South Alabama (5-7, 3-5) a 27-24 lead. Matics kicked his 50-yarder to tie it with 6:51 remaining.
Moore ran for 4 yards on a fourth-and-2, then ran for 24 yards. On the next play, he was stalled by three defenders two-yards short of the end zone, but his teammates pushed him in for an 18-yard game-winner.