The study aims to investigate the relationship between behaviour factors and the resultant knowledge sharing to capacitate SMEs. The study was quantitative and used a cross-sectional survey design. Questionnaire was administered to 200 senior personnel of SMEs in South Africa. Findings show that there is a significant relationship between self-learning knowledge sharing and the selected behaviour factors such as facilitation, conduct and ability. The study recommends managers and owners to instil and encourage self-learning among employees and to cultivate a knowledge sharing culture to ensure sustainability in SMEs.