Based on the extended Theory of Planned Behavior (TPB) model, this paper reveals the influencing mechanism of planned behavior and the moderated mediation effect of social interactivity in Chinese sports tourism in the post-pandemic era. To provide a reference basis for improving people’s intentions regarding sports tourism and promoting the construction of sports tourism in China. This paper takes Chinese sports tourists as the research object, and 1422 questionnaires were used for data analysis. Comparisons were made through a structural equation model (SEM), and the direct/indirect effects of the hypotheses were tested. The moderated mediation effect of social interactivity was tested using the PROCESS macro model 14.