His first novel, Corridor (2004), published by Penguin Books, India, was widely marketed as India's first graphic novel. However, River of Stories, a graphic novel by Orijit Sen published in 1994, actually holds this honor. His second novel, The Barn Owl's Wondrous Capers, was published in 2007.
Sarnath has also provided illustrations for novels by other authors. He designed the cover for Upamanyu Chatterjee's novel, Weight Loss.
He is the co-founder of the comics publishing house Phantomville, along with his friend Anindya Roy.