This study aimed to investigate the relationship between social ties and knowledge sharing among academics in a research team. A qualitative case study approach was employed, using semi-structured interviews to uncover key factors that facilitate or hinder this relationship. The findings emphasize the crucial role of social ties in facilitating knowledge sharing among academics and highlight the central role of research team leaders in promoting and strengthening these ties. Informal contexts and routines as well as in-person attendance were identified as core elements in cultivating social ties. Conversely, limited face-to-face interactions, workplace location, barriers to participation in informal activities, and differences in worldviews were identified as potential deterrents to the formation of strong social ties. We conclude that institutional administrators and research team leaders should promote shared physical and digital spaces and informal social practices, which, in turn, facilitate personal relationships and stimulate collaboration and knowledge sharing.