Japanese renga (“linked-verse”) poet of the late Muromachi period (1338–1573) who is best known as the compiler of Inu tsukuba shū (c. 1615; “Mongrel Renga Collection”), the first published anthology of haikai (comic renga).

Little is known of Sōkan's life. According to tradition he served as a retainer to the shogun Ashikaga Yoshihisa and became a monk after Yoshihisa's death in 1489. Numerous other legendary tales exist concerning his unconventional lifestyle, which usually characterize him as being destitute and mad, but historical evidence indicates that he earned a comfortable income from teaching poetry and from his calligraphy.

The Inu tsukuba shū, containing haikai by Sōkan and others, was probably written over a period of several years but was not published until some 100 years after its completion. The delay in publication may have been because Sōkan compiled the book for the use of his students and did not intend for it to be published. A more likely reason, however, is the coarse and profane nature of many of its poems. Despite their earthiness, the poems contained a wit and freshness that appealed to the aspiring haikai poets of the 17th century, especially those of the Danrin school, who often tried to imitate their style.