Access to club sports is still not a given for children with ID. Parents and children report numerous structural and social barriers to accessing mainstream sports. Sports clubs, on the other hand, want to include this group of people, but often do not know how to do it. Using a community-based approach, children with intellectual disabilities (8–15 years) and their parents were given the opportunity to participate in an 8-week sports program in four mainstream clubs organized by a self-help organization for people with intellectual disabilities. Focus groups were conducted with all participants (parents, children, and club representatives) before and after the program and evaluated by means of a thematic analysis. The children rated participation very positively and only very occasionally reported that they had been excluded. The parents confirmed this experience, but were nevertheless more critical in their assessment. Outside the research context of this study, the sports clubs hardly provided good support, which can also be deduced from previous negative experiences of the parents. The sports clubs themselves received valuable information about what their failings were: sufficiently available and qualified staff, better access to sports facilities, and a wider range of inclusive groups are needed. On the other hand, there was hardly any prejudice on the part of the non-disabled club members towards the new members with ID, which was evaluated extremely positively, albeit surprisingly, by the sports clubs.