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Today, because of living in the machines age and the resulted less mobility and activity of citizens, the diverse and accessible sports for the citizens has become more important. This research which was carried out by qualitative methodology with fundamental-exploratory nature and using the grounded theory is aimed at designing a conceptual model for citizen sports in Tehran metropolitan area. The purposeful-snowball sampling method was used in the research. Accordingly, in order to collect the data, 25 experts of citizen sports were interviewed, and the Strauss and Corbin paradigm analysis was used to develop the final model. Given the results, motivational and health factors were identified as causal conditions, the hardware and software context was identified as the dominant field, the behavioral, structural and environmental level factors were identified as the intervening conditions. Also, promotional, legal, financial, educational, interactive and developmental measures were identified as strategies, and securing national interests, economic consequences, sport development, health-sanitary and socio-cultural outcomes were identified as the strategies implementation results. Given these findings, one can expect that by identifying the citizen sports conditions and concentration on strategic actions, the functional and operational facilities for its development and growth would be provided in Tehran metropolitan area.