Beilein served as a graduate assistant for the 2008–09 and 2009–10
Michigan Wolverines men's basketball teams. While a graduate assistant at Michigan, he pursued a graduate degree at the
Horace H. Rackham School of Graduate Studies. He then served as an assistant coach to
Paul Cormier for the , as the director of basketball operations for the , and as the head men's basketball coach at
NCAA Division II West Virginia Wesleyan College from 2012 to 2014. He succeeded Jim Boone at West Virginia Wesleyan. At West Virginia Wesleyan the team improved from 12–15 during his first season to 20–12 in his second year. Beilein became the head coach at Division II Le Moyne in 2015. That season, he led Le Moyne to the number 1 seed and the host in the NCAA Division II East Regional. The team was upset in overtime by Merrimack College. In 2018, Le Moyne went on a 12-game win streak, their second longest in program history. The team went on to earn the Northeast-10 Conference Southwest Division's top seed in the 2018 Northeast-10 Conference tournament. They won the 2018 Northeast-10 Conference tournament. They earned a number one seed in the NCAA Division II East Regional, marking the first time an NCAA DII school has hosted an NCAA regional as a number one seed in consecutive seasons since
Bentley University in 2007 and 2008. He repeated as Northeast-10 Conference Coach of the Year. Le Moyne's March 10 victory over
Thomas Jefferson University established many records and firsts: It marked the team's 25th win of the season, which surpassed the 24-win mark established in 1988 (by his father's team) and tied in 1996; It marked the school's 1000th victory; It marked Le Moyne's first NCAA tournament opening round victory since a 1964 win over
Youngstown State University and the school's first NCAA tournament victory since a 1988 consolation game victory over
Kutztown University. The school's March 11 victory over
The College of Saint Rose earned the school its first NCAA tournament regional championship game birth, which they won. The 24th ranked Le Moyne Dolphins lost to 11th ranked West Texas A&M University on March 20 in the Division II quarterfinals, finishing the season with a school-record 27 wins against 7 losses. In March 2019, Beilein was hired as head coach for the
Niagara Purple Eagles men's basketball. However, on October 24, 2019, just weeks before the beginning of the season, Beilein resigned for "personal reasons", with assistant coach and former Duke standout
Greg Paulus named as his replacement on an interim basis. On September 1, 2021, the
Syracuse Stallions of
The Basketball League named him as the new head coach of the team. He became a head coach of the Baldwinsville High School boys high school basketball team in 2022, and resigned in 2024. Beilein was named head coach at
Mohawk Valley Community College on July 22, 2025. ==Personal life ==