Miller had eight rebounds and was 6 of 9 from 3-point range.
No. 1 seed Southern led 29-20 at halftime and never looked back. Southern shot 41 percent from the field for the game. Alabama A&M shot 42 percent but had 17 turnovers. Alabama A&M outrebounded the Jaguars 37-33.
Southern will play No. 4 seed Prairie View, which beat Jackson State 88-75 on Friday, for the SWAC title and the automatic NCAA tournament bid on Saturday.