Recently, companies are striving to solve complex economic, environmental, and social issues required by various stakeholders. In order to solve these issues and achieve sustainability performance, human capital sustainability leadership plays an important role, and SMCS is proposed as a means of effectively and efficiently implementing managerial leadership. Therefore, in this study, considering human capital sustainability leadership, we intend to empirically analyze SMCS and sustainability performance in one framework. As a result of analysis, First, human capital sustainability leadership was found to have a significant positive effect on sustainability performance. Second, human capital sustainability leadership was found to have a significant positive effect on the use of SMCS. Third, SMCS was found to have a significant positive effect on sustainability performance. The results of this study show that various managerial leadership, that is, human capital sustainability leadership, is needed to solve recent various and complex issues, and that sustainability performance can be achieved by considering the relationship between SMCS usage methods. This suggests that unlike in the past, managers are required to have complexity leaderships, and these managers must use processes such as systems built in companies in an integrated and organic manner.