This study aims to evaluate the feasibility and preliminary effects of the MIND-SET Intervention Module, an integrated Motivational Interviewing and Rational Emotive Behavior Therapy (MI-REBT) intervention, among Malaysian primary school students involved in Non-Suicidal Self-Injury (NSSI) behaviour. The module is designed to reduce self-injurious behaviour, improve emotional regulation, and enhance readiness for change among 12-year-old students in school settings. This study will use a quasi-experimental design involving three groups: a MIND-SET intervention group, a PRISMA Mental Health Module group, and a treatment-as-usual group. Data will be collected at pre-intervention, post-intervention, and follow-up stages using validated psychological instruments. The findings are expected to support the development of culturally responsive, school-based mental health interventions for children involved in NSSI behaviour in Malaysia.