Following his playing career, Tuiasosopo became an assistant strength coach in 2009 at his alma mater, the University of Washington. He moved to UCLA in 2011, on the staff of Neuheisel, his former head coach. He remained with UCLA under new head coach Jim Mora as the tight ends coach in 2012, then returned to the University of Washington in 2013 as quarterbacks coach under fifth-year head coach Steve Sarkisian. Upon Sarkisian's acceptance of the USC head coaching job at the end of the 2013 regular season, Tuiasosopo was named interim head coach for Washington's bowl game. Shortly after leading the Huskies to a win in the 2013 Fight Hunger Bowl Tuiasosopo left Washington to join Sarkisian's staff at USC as tight ends coach and was also given the title of associate head coach.