Despite a long, common tradition of economics and other social sciences, today they appear fragmented, highly specialized, and often methodologically opposed to each other. Consequently, the social sciences of sport suffered the same artificial separation during the past decades, which actually trace back to paradigmatic disputes at the end of the 19th century and following mutual ignorance. Since about the 1970s, however, new disciplines and academic schools emerged as a response to methodological criticism and dissatisfaction with the state of the arts in social sciences as well as real world developments stimulating new unifying approaches. The scholarly work in sports has been notably struck by the fast commercialization and professionalization of the sport system, giving rise to the new fields of research and academic education of sport economics and management. In this kind of position paper, we argue for 3 interaction levels of interdisciplinarity, which underpin (a) a socioeconomic approach to sports (i.e., a unifying social sciences approach), and (b) the potential of research on sport as a social and economic phenomenon with regard to impulses for the ongoing theoretical discussions in economic and social sciences. Case studies from fitness and event markets provide some lessons for the socioeconomics of sport.