In May 1991, it was reported that Sims and fellow Mississippi Valley State alum, quarterback Willie Totten, had signed with the New Orleans Night of the Arena Football League (AFL).[7] Sims played in eight games for the Night during the team's inaugural 1991 season, recording 13 solo tackles, three assisted tackles, three sacks, and one blocked kick.[1][3] He was an offensive lineman/defensive lineman during his time in the AFL as the league played under ironman rules.[1] Sims earned second-team All-Arena honors for his performance during the 1991 season.[8] The Night finished the year with a 4–6 record.[9] Sims stood 6'3" and weighed 285 pounds during his AFL career.[3]