Sagardía studied instrumental composition with Adriana Hölzsky and Hans-Joachim Hespos at the Hochschule für Musik und Theater Rostock and later at the Folkwang Universität der Künste with
Nicolaus A. Huber and Günther Steinke as well as electronic composition with Dirk Reith.

He received grants for his work from the Ensemble Modern Akademie, Cité internationale des Arts Paris, Villa Aurora Los Angeles, Künstlerhof Schreyahn, Berlin Senate for Culture and Europe, the Musikfond , Akademie der Künste Berlin and Künstlerhaus Lukas/ NES – Artist Residency Skagaströnd Iceland. His screenplay Schwarze Ähre was awarded first prize by the Goethe-Institut St. Petersburg.

His music led him to collaborate with the Ensemble Gelber Klang, Ensemble Adapter, Ensemble Kaleidoskop, Wolfgang Zamastil, Ruth Velten, Chris Grammel, Björn SC Deigner, Florian Werner, Federico Dörries, Gordon Kampe, Maximilian Marcoll, Olaf Hochherz, Lennart Dohms, the Niederrheinische Sinfoniker, the Helios Quartet, Manuel Nawri, the string trio 3cordes and pianist Jan Gerdes. He also works with visual artists such as Piero Glina, Sebastian Cremers, Isa Melsheimer, Clemens Poole, Porter Diteman, Aron Kitzg and Joshua David. His music is played at various festivals at home and abroad. Sagardía is also a member of the indie rock bands DIKTATOR OHNE LAND, LAB OF THE HALO and PALM PILOT. He is also Member of Initiative Neue Musik Berlin.

In his compositions Sagardía deals with the philosophical definiton of music, its notation, its performing and expressing values and its character of being a pure matter of bodyless event. He further combines this artistical approach with different medias like film, video, theater and language.