The purpose of this study is to identify the role of sport as a soft power for Iran to facilitate its diplomatic relations after the nuclear deal. The research method used in this study is mixed (qualitative and quantitative): in the qualitative part of the analysis, the study sample was selected via Snowball sampling based on partricipants’ expertise in the sport diplomacy of Iran after two rounds of Fuzzy Delphi Method (FDM) exploratory factor analysis. Seven components of political currents, cultural exchange, peacemaking, national unity, economic development, transformation, communication, and religious currents were extracted. After identifying the study’s research variables in a structural-interpretive modeling, the relationship between variables was examined through a structural equation modeling test. The results of the structural equation model indicated that political currents, cultural exchange, transformation and communication had a direct and significant effect on national unity. The relationship between political and peacebuilding was not confirmed, but national unity and excellence in peace diplomacy had a direct and significant impact on the economic development of societies.