The survey data derives from a newly-developed questionnaire of interaction mindset. Interaction mindset pertains to second language (L2) learners’ disposition towards the task and/or an interlocutor prior to and/or during task-based interaction [1]. The theoretical model is consisted of five factors: (a) peer interaction; (b) collaboration; (c) form-orientation; (d) provision of peer feedback; and (e) reception of peer feedback. In the larger study (“Predicting L2 learners’ noticing of L2 errors: Proficiency, language analytical ability, and interaction mindset” [2]), the questionnaire results were used as predictor variables of L2 learners’ attention to language form. The current dataset contains responses from 102 L2 learners in university-level English classes. In addition to the descriptive statistics of the questionnaire, the current article reports on the results from structural equation modeling explaining the unique contributions of the five factors to the construct of interaction mindset. The model is visually depicted with a figure using AMOS. The model shows the questionnaire's potential in examining L2 learners’ affective variables that may influence the learners’ cognitive and behavioural engagement patterns. The entire dataset is included in an Excel file (.xlsx) and the original questionnaire is included as a supplementary file.