This study addresses a research gap in the strategic management of knowledge sharing, as current knowledge management strategies do not adequately cover this aspect. Through the lens of Activity Theory, we aim to create a generic knowledge sharing strategy. We conducted interviews with 13 participants, analysing the data through thematic analysis. The study examines six key elements within Activity Theory—subject, object, tools, community, rules, and division of labour—that significantly impact knowledge sharing. Based on these elements, we developed an individual AT model, highlighting essential contradictions in knowledge sharing. We then proposed establishing knowledge communities and updating the individual AT model to mitigate the contradictions. Additionally, we introduced a role identification matrix, particularly in the division of labour, to clarify roles and responsibilities within the new strategy. The strategy has broad applicability for organisations seeking to formalise and optimise their knowledge sharing practices.