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Purpose: This study aimed to investigate the effects of flossing band intervention on wrist joint range of motion (ROM) and hand grip strength in healthy adults. Methods: Twenty university students identified as being at risk of smartphone overuse were randomly assigned to either a flossing band intervention group (n=10) or control group (n=10). The intervention group performed flossing band exercises for 10 min, three times per week, over a 4-week period. Wrist ROM (including ulnar and radial deviation, flexion, and extension) and grip strength were measured before and after the intervention. Data were analyzed using paired t-tests with significance set at α=.05. Results: The flossing band group showed significant increases in flexion and extension ROMs. Although ulnar and radial deviation ROMs also showed increases, they were not significant. The control group showed significant increases in ulnar deviation ROM; however, there were significant decreases in radial deviation, flexion, and extension. Grip strength increased significantly after the intervention in the flossing band group (p<.05). The control group showed a decrease in grip strength after the intervention; however, this decrease was not significant. Conclusion: Flossing band application was effective in enhancing wrist flexion and extension ROMs and hand grip strength. These findings suggest that the flossing band technique may be a useful clinical tool for improving upper extremity function and can be applied in rehabilitation and athletic training settings. Further studies involving clinical populations and investigating long-term outcomes are warranted.