He played the first three games of the 2020 season before being placed on injured reserve for a knee injury on October 9, 2020. He was activated off it on November 7. Sims played twelve games in the regular 2020 season and recorded 27 receptions for 265 yards and one touchdown. In his first playoff appearance, Sims caught three passes for 33 yards and recorded the only Washington receiving touchdown in the Wild Card Playoff game against the Tampa Bay Buccaneers. He was released on August 23, 2021.
