The purpose of this research is to investigate how sustainability in economic, social, and environmental dimensions can be enhanced through supplier development in the healthcare supply chain. Data were collected through a survey study, and partial least squares-structural equation modelling (PLS-SEM) was employed for data analysis. The findings demonstrate that strengthening relationships between customers and suppliers is a key factor in enhancing supply chain sustainability. This study reveals that improvements in the activities that contribute to supplier development have a significant impact on fostering trust, customer awareness, and the supplier's brand image. These enhancements can significantly improve supply chain sustainability within the healthcare industry. The research results aim to provide an integrated perspective on supply chain sustainability, emphasising its economic, social, and environmental dimensions.