Born in Mieres, Asturias, Villanueva graduated from Caudal Deportivo's youth setup, and made his senior debut while on loan at amateurs Santiago de Aller CF in 1994.
Sergio Villanueva is known as an Actor, Writer, and Director. Some of his work includes On the Fringe, The Dark Hour, Nubes Rojas, En fuera de juego, The End of a Mystery, The Forest, Si-o-se Pol, and Tranvía a la Malvarrosa.