The aim of the present study is to discuss about the effects of sports participation on internal motivation and life quality in recreational and sports parks of west of Iran in addition to presentment of a model. The research method employed in this article is a descriptive-correlative method and the population includes the entire people who spend time in recreational parks located in west of Iran. Among the population, a number of 360 individuals were selected as the sample through the Cochran's formula and an availability sampling method. For the purpose of data collection, the questionnaires of participation motivation, internal motivation and life quality were employed. The reliabilities of aforementioned questionnaires were approved by Cronbach's alpha formula, and for analysis of data the tests of Kolmogorov-Smirnoff, one sample t-test, Pearson's correlation coefficient and simple regression and the structural equation modeling software of PLS were used. Results indicated that sports participation and its dimensions are in a suitable situation. Moreover, life quality and its magnitude were also in a suitable condition. There was a significant and meaningful relation discovered among sports participation, life quality and its dimensions and internal motivation and its dimensions. In addition, sports participation is able to anticipate life quality and internal motivation.