He played college football at Kansas and signed with the Washington Redskins as an undrafted free agent in 2019.

[1] A 2-star recruit, Sims committed to Kansas over offers from McNeese State, Prairie View A&M, Southeastern Louisiana, Southern, and Stephen F.

[5] He had his first career reception, a three-yard gain from Case Keenum, in a Week 2 loss to the Dallas Cowboys, along with three carries for sixteen yards.

[8][9] In Week 16 against the New York Giants, Sims caught six passes for 64 yards and two touchdowns during the 41–35 overtime loss.

[24] In the Divisional Round against the Ravens in the playoffs, Sims returned a punt 67 yards for a touchdown in the 34–10 loss.