Johnson began his coaching career at
Northwestern State in
Louisiana as a graduate assistant before becoming a defensive ends/linebackers coach at the school. He then served as defensive line coach and also outside linebackers coach at
McNeese State. Johnson spent one season at
Miami before returning to Louisiana as the defensive line coach at
Louisiana Tech. He then spent two seasons as defensive line coach at
Arkansas before moving to
Texas A&M as their defensive line coach. He then returned to Arkansas as their defensive line coach for one season before moving to the
NFL. Johnson's intentions to retire following the 2020 season were made public on December 21, 2020, but he stayed on staff at LSU for the 2021 season as a defensive analyst. ==Professional coaching career==