This study attempted to point out the role of social capital and explicit as well as tacit knowledge sharing to build human capital of students in higher educational institution in Indonesia. The research model was adapted and inspired from Aslam et al.'s model, however, we modified knowledge sharing variable by dividing it into two types of knowledge, i.e. explicit knowledge and tacit knowledge. The data collection conducted by spreading online questionnaires to students in several higher educational institutions in Indonesia. As many as 420 valid sample data was used to test hypotheses by using structural equation modeling (SEM). The result shows that the influence of component social factor between tacit knowledge sharing and explicit knowledge sharing is different. The components of social capital that influence to explicit knowledge sharing are shared language, social interaction ties, norm of reciprocity, identification and trust. However, the components of social capital that influence to explicit knowledge sharing are identification, norm of reciprocity, social interaction ties, shared language, shared vision. Moreover, tacit knowledge sharing is more influenced to human capital than explicit knowledge sharing. The result of this research can be used as basic knowledge for system developer to define features of knowledge sharing system in higher educational institution in Indonesia.