The purpose of this paper is to investigate the emotional regulation ability of insecure adult attachment mother's by sand tray play. The experimental group consists of 2 mothers with insecure attachment in a preliminary testing. Both mothers had children with insecure attachment in N Child-family counseling center located in Gyoungsangnamdo. The sand tray play is the counseling media, and McAdams’ narrative psychology was applied. Each program lasted for 50 minutes, which includes making sand tray, listening, and cleaning. Moreover, the program was held once a week for 10 weeks. The results include the followings: Firstly, sand tray play reduced emotional regulation difficulties, anxiety, depression in insecure adult attachment mother's. Secondly, mothers with insecure adult attachment were led to the realization of their childhood experience's meaningfulness through sand tray play, and small subject and eight subject-matter of the four sub-categories of 20 is extracted, accepted these realizations. Even though this study shows sand tray play has positive influence on insecure adult attachment mother's, further study is required, since this case study only included a small number of experimental subjects.