This study aimed to verify the relationship between youth sport participation, socialization agents, and life satisfaction. Aim and Scope: It is conducted on a pilot study of 181 adolescents residing in Seoul in December 2019 and the main study of 539 adolescents residing in Seoul in February 2020. Data acquired from both the pilot and main study were analyzed using frequency analysis, reliability analysis, validity analysis, descriptive statistics analysis, and path analysis. Method: These analyses yielded the following results. First, socialization agents were found to influence sport participation positively. Second, sports participation motivation was found to influence sport participation positively. Third, sports participation engagement was found to influence sport participation positively. Conclusion: Based on these findings, this study discussed the importance of recognizing socialization agents__ampersandsignrsquo; importance in driving adolescents__ampersandsignrsquo; motivation to participate in sports and the need to provide adolescents with a variety of sport participation opportunities to raise their life satisfaction.