Objective: To evaluate the properties of Thai version of the modified physical activity enjoyment scale (PACES) for high school students.

Materials and Methods: There were two steps in this study; developed Thai version of PACES and evaluated its properties by using factor analysis. The participants in this study were high school students in Phetchabun province, Thailand. There were 27,744 high school students in Phetchabun province. We use a simple random sampling method to recruit participants for the total of 800: 400 from junior and senior high school. The development of Thai version of PACES was performed by using back translations and comprised of positive and negative items. Structural equation model (SEM) with confirmatory factor analysis (CFA) was used to evaluate the structural validity and reliability.

Results: An age range of participants was 12 to 18 years. The final model combined both positive and negative items had the t score for positive items of 13.72 (p < 0.01) and for negative items of 19.44 (p < 0.01), respectively. The construct reliability was 0.936 with the average variance extracted of 0.482. Factor loading for positive and negative items in the final model was 0.58 and 0.49, respectively. The final model had acceptable goodness of fit indices.

Conclusion: The Thai version of modified PACES was feasible to evaluate the enjoyment of physical activity in high school students.