Muñoz began his professional acting career at the age of nine, debuting in the film The Devil's Backbone, directed by Guillermo del Toro.

A few years later he received his first starring role in the TV series Dime que me quieres ["Tell me that you love me"], with Imanol Arias and Lydia Bosch.

Muñoz also studied music as a child, learning piano and drums, and presently performs with a band as drummer and singer.

Arena en los bolsillos is a film about 4 young boys, Iván, Lionel, Jenny and Elena, from a neighborhood on the outskirts of Madrid.

Muñoz was awarded "Best Actor" at the 2008 NoteCortes FilmFest for his performance in the short film Paredes, directed by Jorge Galerón.