There have been many studies for knowledge sharing within the organizational communities, yet very few research has been done on the factor of internet self-efficacy affecting the individuals' knowledge sharing behavior. Drawing from the theory of planned behavior (TPB), this paper examines the relationships between the internet selfefficacy, attitude towards knowledge sharing, subjective norm, perceived behavioral control, intention to share knowledge, and knowledge sharing behavior. Survey questionnaires are administered to 301 university students. Results indicate that the internet self-efficacy significantly affect the attitude towards knowledge sharing. Intention to share knowledge is predicted with more favorable attitude towards knowledge sharing, subjective norm, and perceived behavioral control. Intention to share knowledge also significantly influences the individuals' actual knowledge sharing behavior. This paper concludes with a discussion of research implications of the study.