Sihan started playing the cello when he was 8. He learnt the cello under Chan Wei Shing, Herminia Ilano and obtained a Diploma in Music Performance from the Nanyang Academy of Fine Arts under the tutelage of Yu Jing.
Chan Sihan has played in numerous ensembles and orchestras, including the Singapore Festival Orchestra, Singapore Chinese Orchestra, The Philharmonic Orchestra, Singapore Lyric Opera, Philharmonic Youth Winds ensemble, the Singapore Armed Forces Band, the Chamber Players, and the Singapore National Youth Orchestra, in which he was the associate principal of the cello section in 2006. He was also the only string player to represent Singapore in the South-East Asian Youth Orchestra/Wind Ensemble in 2006. He is also the cellist of Chamber Sounds, a local chamber group dedicated to promoting and premiering local works written by fellow Singaporean composers.
Sihan has also worked with world-renowned artists such as David Foster, Andrea Bocelli, Jeff Chang, Nobuo Uetmatsu, Tan Dun, Charice, Natalie Cole, Ruben Studdard and Katherine Jenkins.
He is currently a freelance chamber and orchestral musician. He also teaches the cello in the Methodist School of Music and privately.