[3] Marin spent 2008 and 2009 as the pitching coach at Harvard-Westlake High School in North Hollywood, California.

He was the pitching coach for the Leones de Ponce of the Puerto Rican Winter League during the 2012 offseason.

[1] In 2013, Marin was the pitching coach of the Spokane Indians of the Class A Short Season Northwest League.

[6] In 2016, Marin was the pitching coach of the High Desert Mavericks of the Class A-Advanced California League.

[7][8] Marin rejoined the Texas Rangers organization, for the first time on a major league staff, serving as their bullpen coach for the 2019 season.