The theory of planned behavior (TPB) is a widely used framework for predicting behavior. Considering that technology supported sexual behavior (e.g., sexting) is widespread among emerging adults, it is logical to assume that it is driven by existing social norms, accepted standards of behavior, and the opinions of others, all of which are core constructs of TPB. Therefore, the purpose of this study is to examine whether intention to sext can be predicted by the constructs of the theory of planned behavior. A quantitative cross-sectional study was conducted with 314 emerging adults aged 18–29 years who completed a self-report questionnaire online. The modified Theory of Planned Behavior Questionnaire for the sexting context, which measures attitudes toward sexting, subjective norms, and perceived behavioral control, and sexting intention, was used. The results of the path analyses mainly confirmed the model proposed by the Theory of planned behavior. Of the three TPB core factors, only subjective norm did not significantly have effect on sexting intention. Our results show that attitude, normative beliefs, and control directly predict sexting intention, and control beliefs indirectly predict sexting intention via perceived behavioral control, partially confirming the sequential relationship proposed by the Theory of planned behavior.