Although sport has been long regarded as an effective tool of social intervention program, many have questioned whether it really generates positive social outcomes or not. Such questioning, in part, is caused by the fact that sport scientists have not much provided adequate rationale for the sport-related intervention programs. In this regard, this study attempted to design, implement, and evaluate a theory-based sport-related intervention program to solve youth violence, guided by theory-based evaluation. In order to examine the effect of the sport-related program, we employed a quasi-experimental research method including a pre-post test design with both a treatment group and a control group. A total of 41 students from two middle schools located in a metropolitan area of South Korea participated in this study during 12 weeks. By delivering sport activities(i.e., soccer, tennis), this program was supposed to change the 12 risk factors. The measures of the risk factors include 77-item that were adapted from the previous youth violence studies. The main findings of this study indicated that (1) the sport-related intervention significantly reduced the growth of violence incidence rate and lowered the scores of four risk factors(i.e., school attachment, tradition/norm attachment, perception of school atmosphere, and attitude toward sport team) in the treatment group compared to the control group, (2) the scores of six risk factors in the treatment group(i.e., commitment on school, school attachment, tradition/norm attachment, perception of school atmosphere, attitude toward sport team, and attitude toward parent) were lowered, while (3) the scores of most risk factors in the control group were increased.