With the rapid improvement and wide application of network technology and the maturity of network tools, the network course platform has become a popular direction of teaching research in colleges and universities. The purpose of the psychological sand table online course is to enable students to achieve self-catharsis, release pressure and reflect self-growth through sand table and sand tools. The research purpose of this paper is to design the network platform of psychological sandbox course based on data mining. In the experiment, the sandplay course designed a 12-hour course corresponding to the mental health education course. Taking the students of Class 1 and Class 2 of the psychology education major of Wuyi University in Fujian Province as the research object, a questionnaire survey and an independent sample T test were carried out on the class. Therefore, the group psychological sandplay game course in colleges and universities is carried out, and the evaluation of the implementation effect of the psychological sandplay course network platform is studied in the experiment.