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.

Sōtō Zen or the Sōtō school is the largest of the three traditional sects of Zen in Japanese Buddhism. It is the Japanese line of the Chinese Cáodòng school, which was founded during the Tang dynasty by Dòngshān Liánjiè. It emphasizes Shikantaza, meditation with no objects, anchors, or content. The meditator strives to be aware of the stream of thoughts, allowing them to arise and pass away without interference.