Most childhood cancer survivors are insufficiently active. Researchers are focusing on strategies to increase physical activity (PA). However, a detailed understanding of participation in specific types of PA is missing, meaning current strategies may lack relevant information. Thus, our study sought to analyze participation in different types of PA commonly engaged in by children: organized sports, physical education in school (PES), therapeutic exercise, and non-organized leisure-time PA. Thirty-eight childhood cancer outpatients and 51 healthy children completed questionnaires. Compared to healthy children, childhood cancer outpatients, especially those who are shortly after cessation of inpatient treatment, participated significantly less often in organized sports and PES and significantly more often in therapeutic exercise compared to the healthy children. Considering organized sports and PES afford children unique social benefits and provide the potential to motivate lifelong activity, future efforts should be placed on ensuring children with cancer can access these types of PA. Educating parents, teachers, and coaches, exploring referral pathways to exercise professionals and providing individual support may enhance participation rates in organized PA and should be investigated.