Father Sundar started writing in 1968. He acknowledges his debt of gratitude to his literary mentors, among which Saman S. Lall and Salik Rabbani are significant. And for his literary endeavours, he has been awarded by Humsookhan, Naqeeb, Kundan and Stoon-e Haq. He has contributed extensively to various Christian magazines in Pakistan.
So far Siddique Mark Sundar has published two volumes of Poetry, Karrva Ghount (1989), and Zawiyay (1999).