The fast advancement of communications, mobile technologies, and the proliferation of smart devices has increased the importance of sharing economy. Nowadays it offers several opportunities for consumers. The debate about this new consumption is increasing all over the world. We developed an integrated model by examining how intrinsic and extrinsic motivations influenced consumers’ intentional behavior in the context of sharing economy. We proposed a theoretical model based on the self-determination theory and the most representative constructs from literature review, providing new insights for the participation in sharing economy and how it influences consumers. To test the conceptual model we collected data from 256 respondents. The study investigates the determinants of post-adoption, i.e., users' behavior and continuance intention to use in sharing economy. The results show that participation in sharing economy is motivated by several determinants. Enjoyment, social influence, sustainability, economic benefits, utility, and mobile device capability were found important in explaining users’ behavior. Enjoyment, community, economic benefits, utility, mobile device capability, and user behavior were found important in continuance intention to use sharing economy. This shows the importance of intrinsic and extrinsic motivations in the explanation of user behavior and continuance intention to use sharing economy.