 Sutomo was born in Kampung Blauran in the centre of Surabaya to a clerk father, Kartawan Tjiptowidjojo, and mother of mixed Javanese, Sundanese and Madurese descent.He had received Dutch secondary education before the Japanese occupation.Alongside menial jobs, he joined the Indonesian Scouting organisation and at the age of seventeen as the second Pramuka Garuda; a rank achieved by only three Indonesians before the Japanese occupation during World War II.