The aim of present study is to investigate the effect of constraints on the motivation of ski resort tourists. The population includes all of ski resort tourists in Shemshak and Tochal stations which has attended in sports at least three times in the year. Regarding to unfeasibility of certain population and uncertain size, the sample size was determined through Cochran formula (N=141). The data were gathered by Wei (2008) questionnaire. Reliability was tested through Alpha Cronbach for constraints and motivation as 0.756 and 0.898, respectively. In order to analyze the data, descriptive statistics (mean, standard deviation) and inferential statistics (Kolmogorov, Smirnoff, correlation coefficient of Pearson, and multi-various linear Regression) were used at the level of P≤0.05. The results showed that there was meaningful reverse relationship between constraints and its dimensions and motivation of ski resort tourists (r- 0.362, P=0.001). Also, the interpersonal factors (t=2.251, B=0.247) and structural factors (t=2.331, B=0.238) were the most effective predictors. Therefore, regarding to the results, facilitating the tourists’ attendance through training and taking advantage of experiences in the field of ski and resolving structural constraints in order to provide security for tourists is so important for enhancing their motivation and continuous attendance in sky resorts.