Eating out has been increasing in recent years due to various reasons such as celebrations, pleasure, and business. Accordingly, the foodservice industry has been rapidly developing in Korea. However, the foodservice industry is reaching saturation, and the market is turning unfavorable, especially for small-sized enterprises. Meanwhile, studies claim that individuals’ self-management is a significant determinant of performance outcome; therefore, the purpose of this study is to identify the relationships among self-management, job involvement, and non-financial management performance of small-sized foodservice managers. To investigate the relationship, the researchers conducted an onsite survey to managers of small-sized foodservice enterprises in Gwangju, South Korea. The survey was conducted from May 1 to June 15, 2018, and a total of 287 questionnaires were collected with 259 usable for analyses. Results of the structural equation model show that all sub-factors of self-management (mental, personal relationship, living, and career management) of the mangers had a positive influence on job involvement, while job involvement positively affected non-financial management performance. These results indicate that a manager of a small-sized foodservice enterprise should manage himself or herself to create profit through job involvement.