Post-Occupancy Evaluation of Sports Parks during the COVID-19 Pandemic: Taking Sports Parks in Beijing as Examples

China fully built a wealthy society but faced a serious COVID-19 epidemic together with the rest of the world. The emergence of the epidemic highlights the importance of sports parks for physical activity. By reviewing national fitness policies and identifying several types of sports parks, this paper investigates urban dwellers’ usage and preferences in sports parks by means of a questionnaire, with behavioural observation and interviews as complementary research methods. Taking the Beijing Olympic Forest Park, Sun Park, and Huilongguan Park as examples, this study reveals that participants present a high overall satisfaction with the sports parks. The factor analysis indicates that Sports Facilities and Maintenance & Management are the first and second most significant factors influencing residents’ willingness to use sports parks. This research can guide the planning and construction of sports park in the future.