In 2005, Manny Dandan, the then-head coach of NU Bulldogs invited Napa to join the team as an assistant coach and he later accepted it.
Move to Letran Knights Napa emerged as one of the frontrunners for the coaching job of the Letran Knights, replacing NCAA Season 91 men's basketball champion coach
Aldin Ayo who is now the head coach of the
De La Salle Green Archers in the UAAP. Right after the championship run of NSNU Bullpups on the UAAP Season 78 juniors basketball tournament, Napa openly admitted in an interview that he is in talks with the
Colegio de San Juan de Letran officials about his possibility to take over the coaching duty for Letran Knights. The search committee unanimously voted for Napa after a series of interviews of applicants including Napa, Mapua Cardinals assistant coach Randy Alcantara, Adamson Falcons assistant coach Mike Fermin, and Letran alumnus Elvis Tolentino. On March 8, 2016, Napa was appointed as the new head coach of Letran Knights men's basketball team in a news conference held at the Salon de Actos in the Letran's main campus in
Intramuros,
Manila. He also decided to stay in the NU Bullpups program as a team consultant. Napa will be the second non-Letran alumnus to take the coaching job of the men's basketball team, after
Louie Alas, who handled the team that won three championships in NCAA men's basketball.
Return to National University Napa will return to National University, this time coaching the seniors team NU Bulldogs starting in 2022. ==Coaching record==