The theory of planned behavior (TPB) explains the intentions of human behavior with variables of attitudes, subjective norms, perceived behavioral control, etc., aiming to understand decision-making processes. However, due to the theory`s insufficient explanation, the need to add new variables has been stressed. This study is intended to analyze the intentions of visiting islands by adding a new variable of novelty for the extended theory of planned behavior. To fulfill the purpose of the study, a hypothesis was deducted through literature study and previous researches. Also, a survey of 235 tourists who were visiting Muui in Incheon was conducted for the final analysis, where SPSS 20.0 and AMOS 18.0 were used. This study finds that attitude, perceived behavioral control and novelty have an influence on the intention of visiting tourist attractions, whereas subjective norms do not. For further research, it is necessary to specify the purpose of visit to islands by adding more valuables to extend the theory.