Research has identified Internet gaming addiction as a new and often unrecognized clinical disorder that impacts users' ability to control Internet gaming use, which can lead to relational, work, and social problems. The locus of control is a factor in controlling the use of Internet games. Researchers have suggested using cognitive behavior therapy (CBT) as the treatment of choice for Internet addiction. This paper presents the findings of a study that utilized an A‐B‐A single‐case research design to explore the impact of CBT on enhancing internal locus of control and reducing Internet gaming addiction. The participants in this study were three high school students (N = 3) who exhibited a high level of Internet gaming addiction and a predominantly external locus of control. CBT intervention was provided in six sessions. Treatment focused on modified cognitive distortion and developing positive behavior using the down arrow technique, acting as if, shaping, problem‐solving, and behavior reinforcement. Participants completed the Game Addiction Scale for Adolescents and the Locus of Control Scale for Game Addiction. Data were obtained at three distinct phases: before, during, and after the CBT intervention. Results show that CBT reduced Internet gaming addiction and enhanced internal locus of control both during and after the intervention, indicating its potential as an effective treatment for students with gaming addiction issues.