Higher education is under constant transformation through the use of new pedagogical models such as university service-learning (SL). Indeed, there has been an exponential uptake of university SL, among others, in the field of physical activity and sport (PAS) along with research examining these practices. However, these initiatives highlight the need to improve the quality of research in this field. This paper presents a systematic review focused on how research in this arena has been carried out, examining the following topics: paradigm, methods, instruments, discipline, limitations, and further research. A total of 45 articles met the inclusion criteria. The results show that qualitative and mixed methods have experienced an increasing progression. The most recurrent instruments have been questionnaires, reflective diaries, and interviews. According to the studies in the sample, the limitations point to research designs and some difficulties that underlie the pedagogical model itself. Finally, further research calls for longitudinal studies and to deepen the reflective process. This review identifies some weaknesses and strengths of research in university SL in PAS that aspire to inform and improve future investigations in this field.