[1] Sang was a member of the Arbujad literary group, which represented a new direction in Estonian poetry before the outbreak of World War II.
Under the pseudonym Injo, he successfully participated in a literary competition run by the youth magazine Kevad in 1934 with his quick tempoed poem Improvisatsioon.
His collection of poems Üks noormees otsib õnne was published in 1936, with which he scored his breakthrough.
In the late 1930s, he joined in the literary circle Arbujad which included such prominent early poets and authors as Bernard Kangro, Uku Masing, Kersti Merilaas, Betti Alver, Mart Raud, Heiti Talvik and Paul Viiding.
Alongside his literary activities August Sang translated poetry and prose from the German, Russian, French and Czech into Estonian, by authors such as Goethe, Peter Weiss, Maxim Gorky, Vladimir Mayakovsky, Franz Kafka, Gottfried Keller, Molière, Egon Erwin Kisch, and Lion Feuchtwanger.