This study aimed to examine the university student's internet addiction, perceived freedom in leisure, leisure boredom, and sensation seeking level with regard to gender and physical activity participation, and to investigate the relationship between internet addiction, perceived freedom in leisure, leisure boredom and sensation seeking. The participants who were chosen using a convenience sampling method filled the "Short Form of Young's Internet Addiction Test" (YIAT-SF), Perceived Freedom in Leisure Scale (PFLS), "Leisure Boredom Scale" (LBS), and "Sensation Seeking Scale" (SSS). T-test, MANOVA, ANOVA and correlation analysis were used to analyze the data. T-test results indicated there were no significant differences in the mean scores of "YIAT-SF" with respect to gender (p> 0.05). However, analysis revealed significant differences in the mean scores of "YIAT-SF" with regard to not regularly physical activity participation. There were significant differences in the mean scores of "PFLS" in favor of men participants and regularly physical activity participants (p<0.05). Gender and regularly physical activity participation were significant of "LBS" (p<0.01) in favor of women participants (p<0.05). Similarly, gender were significant of "SSS" (p<0.01) on the all sub-dimensions in favor of men participants (p<0.05). However, there were no significant differences in the mean scores of regularly physical activity participation.