The new generation of computer network technology has driven the development of the whole society and brought about earth-shaking changes. In the context of “Internet +”, the combination of the Internet and education has created today’s diversified online course model. Fitness yoga can stretch our limbs well. The teaching of physical education courses of fitness yoga in colleges and universities can alleviate the students’ long-term tension for learning and play a role in exercising and cultivating all-round development talents. This article takes the current status of online sports yoga courses in ordinary universities as the research object and uses a series of research methods to organize and summarize the teaching team, number of class selections, course evaluations, learning resources, etc. of online yoga courses in ordinary universities. Further, this paper designed a set of course teaching system based on computer network. The system is embedded with multimodal yoga action posture detection, which can solve related problems in yoga online teaching. The realization result proves that the system effectively improves the learning effect and comprehensive quality of students and has strong operability and feasibility.