The present study aimed at identifying the level of aggressive behavior in students, formulating hypothetical drafts of products, and develop self-regulation of emotion module for reducing students' aggressive behavior. This study adapted the research and development of Gall, Borg & Gall, which in the development procedure was limited to three stages, namely (1) identification of students' aggressive behavior; (2) the formulation of hypothetical draft of self-regulation of emotion module; and (3) Product feasibility test which was carried out by expert and practitioner. The data were analyzed using quantitative descriptive analysis. The study was conducted in Junior high schools in the Special Region of Yogyakarta. The result of the study showed that the self-regulation of emotion module was developed by including the components of selfregulation of emotion, namely receiving, evaluating, triggering, searching, formulating, implementing, and assessing. Besides, the self-regulation of emotion module is categorized as feasible to be implemented by the counselor to support the counselor's program in reducing students' aggressive behavior.