Hakuun Yasutani was a Sōtō priest and the founder of the Sanbo Kyodan, a lay Japanese Zen group. Through his students Philip Kapleau and Taizan Maezumi, Yasutani has been one of the principal forces in founding western (lay) Zen-practice.

Sanbo Kyodan is a lay Zen school derived from both the Soto (Caodong) and the Rinzai (Linji) traditions. It was renamed Sanbo-Zen International in 2014. The term Sanbo Kyodan has often been used to refer to the Harada-Yasutani zen lineage. However, a number of Yasutani's students have started their own teaching lines that are independent from Sanbo Kyodan. Strictly speaking, Sanbo Kyodan refers only to the organization that is now known as Sanbo-Zen International.