The purpose of this study was to evaluate the effectiveness of a sensory-motor psychotherapy-based group program in addressing interpersonal problems and enhancing self-compassion among adults with insecure attachment. To this end, university students who reported difficulties in interpersonal relationships and exhibited high levels of insecure attachment were selected and assigned to either an experimental group or a control group. Ultimately, 5 participants were included in the experimental group and 8 in the control group. To assess the effects, pre-tests were conducted prior to the intervention, post-tests immediately after the program, and follow-up tests six weeks later to examine changes over time. Quantitative data analysis was performed using SPSS 29, with repeated measures ANOVA applied to examine group differences and interaction effects across time points. In addition, qualitative analysis of the experimental group’s subjective experiences was conducted to supplement the quantitative findings. The results indicated that the sensory-motor psychotherapy-based group program brought positive changes in both interpersonal problems and self-compassion. In terms of interpersonal problems and interpersonal mindfulness, significant differences were observed between the experimental and control groups over time, with a notable effect observed at the post-test stage. Self compassion also showed significant group and time interaction effects, with the experimental group exhibiting greater improvements than the control group. The qualitative analysis revealed that participants experienced reduced anxiety and tension in interpersonal interactions, along with increased self-understanding and acceptance. Notably, meaningful changes were reported starting from the fifth week, suggesting that the program effectively contributed to alleviating interpersonal problems and enhancing self-compassion. Based on these findings, the study discussed program restructuring strategies to enhance the effectiveness of the sensory-motor psychotherapy-based group program. The results from the quantitative and qualitative analyses were integrated, and the implications, limitations, and directions for future research were discussed.