Born in a cultivated family, his father was a Catalan poet.
Juli Sandaran studied piano and composition and soon became a jazz pianist, leading jazz ensembles in Barcelona, performing at the Hot Club and at the famous Club Jamboree. He was part of the first Barcelona Jazz Festival, together with artists like Tete Montoliu, Bill Coleman, Lou Bennett and Stephane Grappelli.
As a composer he has written songs, chamber music pieces, religious music, sardanas and music for theater and television shows.
He was an enthusiast amateur cellist with an absolute love for the instrument. He studied cello with Anna Mora and wrote his Suite for 12 cellos for the cello choir that Lluís Claret used to have with his students in Barcelona around 1982.