Purpose: The purpose of this study is to investigate the effect of Sport psychological skill training(PST) based on positive psychology on psychological variables and frontal EEG asymmetry, a psychophysiological index of affect, motivation and anxiety. Methods: Participants were seven shooting athletes whose mean age were 18.3 years. They participated 8 sessions of positive psychology-based psychological skill training program which consisted of a 60 min short lecture and group counseling sessions. Psychological variables (affect, psychological skill, and state sport confidence) and cortical activation at F3, F4, F7, F8, T3, T4 were collected under two conditions(before and after competition recall) before and after 8 sessions of psychological skill training. Electroencephalography(EEG) asymmetry scores and cortical activation at left and right each electrode sites were analyzed. Results: State sport confidence was increased following PST. Before PST, frontal EEG alpha asymmetry scores(FAS) after competition recall was lower compared to FAS before competition recall. However, FAS was not decreased after competition recall following PST. Conclusion: These results suggest that sport psychological skill training based on positive psychology appears to increase state sport confidence and to enhance cortical activation at left frontal region, which is related to positive affect and approach motivation.