At Princeton, he earned Ivy League Player of the Year honors, three first team United States Intercollegiate Lacrosse Association (USILA) All-American recognitions and three first team All-Ivy League selections, two NCAA midfielder of the year honors, NCAA Top VIII Award recognition and two-time Academic All-American (first team once) honors.
[1] As an ambidextrous junior lacrosse midfielder, he scored 20 goals and had 16 assists for the Severn School, earning him All-Anne Arundel County honors from the Baltimore Sun.
[8] As a freshman, he was a member of the 1997 team that is regarded as the best in school history with a record number of wins during its 15–0 season.
[20] The 1999 and 2000 teams also earned NCAA Men's Lacrosse Championship invitations, bringing the schools streak to eleven consecutive seasons.
[21] In Sims' first game as a Tiger, he scored the game-winning goal in a 1997 overtime 7–6 victory over Johns Hopkins.
[24] During the 1998 season, Sims became a scoring threat from midfield as most defenses focused on the All-American trio of Princeton attackmen (Jesse Hubbard, Chris Massey and Jon Hess).
[28] In 1999, he scored a quadruple overtime game-winning goal helping Princeton secure it invitation to the 1999 NCAA Division I Men's Lacrosse Championship tournament with its seventh consecutive victory.
[29] In the 2000 NCAA Division I Men's Lacrosse Championship tournament, he posted two goals and two assists in the 10–7 quarterfinal victory over Maryland.
[34] In 2007 Season he was recognized by the league as one of the top transition players in the game by being named Transition Player of the Week three times and being named to his first National Lacrosse League All-Star Game as a reserve.
[38][39] In 2002 and 2005 he was a member of the Baltimore Bayhawks Major League Lacrosse Champion Steinfeld Cup winners.
[52] As of August 2010[update], Sims was the Major League Lacrosse All-Time leader in post-season goals scored (29).
[57] In college, he helped the Tigers to raise approximately $60,000 for the Central Jersey Pediatric AIDS foundation and worked with the Special Olympics.
[5][7][58] In the season 9 December 9, 2011 episode of Extreme Makeover: Home Edition on ABC, Sims' helped build a house in Mardela Springs, Maryland over a span of 106 hours in just five days.
The nonprofit Project 911 (911nfp.org) along with The Fusion Cos., an Annapolis modular-home builder, built The Johnson-Goslee Family house.
In 2020, during the George Floyd protests, Sims renounced this recognition over the school's "failed leadership" in addressing systemic racism.