Sustainability has emerged as a key concept in the contemporary business landscape. Organisations are increasingly formulating strategies that aim not only to enhance profitability but also to reduce their ecological footprint. Encouraging employees to engage in pro-environmental behaviour is essential for achieving sustainability goals. This study investigates the antecedents of employees pro-environmental behaviours within organisations through the lens of the theory of planned behaviour, incorporating job satisfaction, customer pressure, and hope as influencing factors. Data was collected from 338 employees using a random sampling method and analysed through structural equation modelling (SEM) using AMOS. The findings indicate that job satisfaction, customer pressure, and hope positively influence environmental attitudes. Furthermore, both environmental attitudes and subjective norms were found to positively affect employees pro-environmental intentions. Interestingly, perceived behavioural control exhibited a negative effect on pro-environmental intentions. Additionally, the mediating role of pro-environmental intention in the relationship between environmental attitude and behaviour was confirmed, highlighting the importance of intention development in translating attitudes into actions. These findings contribute to the theoretical understanding of organisational sustainability by emphasising the interplay of psychological, social, and contextual factors. The study offers novel insights into fostering sustainable behaviour in the workplace, providing practical guidance for managers and policymakers.