Introduction: Internet addiction disorder (IAD) is a socio-psychological disorder which includes a habitual dependence  to the Internet and its compulsive and obsessive  misuse. This research intends to clarify the association of various types of social skills, self-efficacies, lifestyles, with IAD among high school sport students.
 
Materials & methods: Considering the goal, this research was a practical. The samples covered 129 high school sport students of secondary  school at their second term of the school year  2016-17 in Ilam ( southern Iran), selected through multistage stratified sampling. Data was gained using the following scales: General Self-Efficacy Scale (GSE), Teenage Inventory of Social Skills (TISS), Lifestyle Questionnaire (LSQ), and Internet Addiction Test (IAT). Data analysis was carried out using SPSS 19 and smart PLS3 applications, respectively.
 
Findings: According to the results, the secondary school sport students’ social skills score at Ilam province was 126.98, GSE 63.51, LSQ 273.51, and IAT 45.88. At. Life style, up to a certainty of 90%, proved to moderate the association  between such  students’ GSE and their IAT.
 
Discussion & conclusions: Based on the results of the current study, lifestyle acted as a moderator in the association of  secondary school students’ self-efficacy with internet addiction. it seems necessary to interfere and make effective interventions to  improve the students’ lifestyle and strengthen their self-efficacies to prevent internet addiction among them.