Sims attended Cristo Rey Jesuit High School in Minneapolis, Minnesota.[1] In his junior season, he averaged 21.8 points, 11.2 rebounds and 3.7 assists per game.[2] As a senior, he averaged 25 points and 10 rebounds per game.[3] Sims left as Cristo Rey Jesuit's all-time leading scorer, with 2,005 points.[2] A consensus four-star recruit, he committed to playing college basketball for Texas, choosing the Longhorns over Minnesota.[4]
College career
As a freshman at Texas, Sims averaged five points and 3.9 rebounds per game.[2] He assumed a more important role late in the season after an injury to Mohamed Bamba.[5] He averaged 4.2 points and 3.6 rebounds per game as a sophomore while missing time with an ankle injury.[6] Sims' junior season was cut short by a stress fracture in his back against Baylor on February 10, 2020.[7] As a junior, he averaged 9.7 points, 8.2 rebounds and 1.2 blocks per game, earning All-Big 12 Honorable Mention.[8] On March 13, 2021, Sims posted 21 points and 14 rebounds in a 91–86 win over Oklahoma State at the Big 12 tournament title game.[9] He averaged 9.2 points, 7.2 rebounds and 1.1 blocks per game as a senior, receiving All-Big 12 Honorable Mention. Following the season, he declared for the 2021 NBA draft while maintaining his college eligibility.[10] He later signed with Klutch Sports, forgoing his remaining eligibility.[11]
Professional career
Sims was selected in the second round of the 2021 NBA draft with the 58th pick by the New York Knicks.[12] On August 8, 2021, he signed a two-way contract with New York, splitting time with their G League affiliate, the Westchester Knicks.[13] On July 9, 2022, Sims signed a three-year, partially guaranteed contract with the Knicks.[14]