Adults in socially vulnerable positions can benefit from participation in community sports programs. However, there is a lack of knowledge about the effective elements of these programs. To identify these elements, we consulted three groups of stakeholders: social sports coaches, program coordinators, and social workers. The effective elements were systematically arranged by means of group concept mapping (GCM), a mixed-methods approach for organizing thoughts. The social sports coaches (n = 14) mentioned 152 effective elements, the program coordinators (n = 5) mentioned 81 effective elements and the social workers (n = 8) mentioned 115 effective elements. Overlapping effective elements were mentioned by all three stakeholder groups, such as the role of the social sports coach, a safe sports climate, and structure of sports programs. However, the sport-specific knowledge and skills of coaches were mentioned only by program coordinators. Moreover, only the social workers provided elements that were protective in nature, such as not overburdening the participants. Average importance scores differed for these elements within groups and between groups. In conclusion, various effective elements were deemed necessary for community sports programs to be successful. Moreover, GCM appeared a successful tool to systematically identify effective elements of an intervention from the perspective of relevant stakeholders. •The social sports coach is vital for successful community sports programs.•Community sports programs should have a safe and positive learning environment.•Program participants should be encouraged to work on personal goals.•Close collaboration with external partners is essential for program continuity.•Group concept mapping is useful to systematically gather data from expert groups.