Caslib has also been the head coach of the Seniors' Football team of San Beda University, the Red Booters.

They won the NCAA championship for the 8 straight seasons after sweeping the competition, and in October 2008 became UNIGAMES champions.

Caslib played high school football for Claret School and in inter-collegiate tournaments, notably the National Collegiate Athletic Association, for San Beda College (now San Beda University).

Caslib led the under-23 national team at the 2005 Southeast Asian Games as head coach.

[1] He also led the Philippine national team in a friendly against Australian club, Perth Glory FC in July 2016 as head coach in lieu of Dooley.