The present study examined psychological, spiritual, physical/leisure and social self‐care behaviours among psychologists using a major model of predicting human behaviour, the theory of planned behaviour (TPB). The study used a mixed method approach with two stages of data collection. Psychologists (N = 200) completed an online questionnaire assessing TPB constructs (attitude, subjective norm, perceived behavioural control and intention) and additional constructs of action planning, coping planning, peer and supervisor norms and organizational climate. Two weeks later, participants (n = 110) completed a follow‐up questionnaire assessing their self‐care behaviour. Results indicated general support for the standard TPB constructs in predicting self‐care intentions for psychologists and the additional construct of action planning mediated the intention‐behaviour relationship across most self‐care dimensions. Findings from the current research provide further understanding of the factors influencing self‐care engagement among psychologists and can be used to inform development of strategies to foster greater engagement in self‐care behaviour.