The purpose of this study was to investigate the changes in a mother's attachment and emotional control resulting from Sandplay Therapy in cases of insecure adult attachment. Additionally, the study aimed to examine the changes in family perception and attachment to the mother's changes. One mother with a high insecure adult attachment score and her family were selected as subjects for this study. Attachment scales, emotional control scales, sentence completion tests (SCTs), and interviews were conducted before and after the therapy to study the subjects' changes in attachment and emotional control, as well as the changes perceived by family members. The mother then underwent 12 sessions of Sandplay Therapy. The results showed that: After Sandplay therapy, the mother's attachment and emotional control demonstrated positive changes. The mother's changes through Sandplay Therapy contributed to the improvement of the family's positive perception and attachment level. The Sandplay box underwent a process of individualization, leading to self-realization. In conclusion, Sandplay Therapy helps stabilize the attachment and emotion of insecure attachment mothers, and the changes in mothers have a positive impact on the perception and attachment of family members. A follow-up study, it is necessary to expand the number of study subjects by attachment type.