The purpose of this study is to research overseas expansion strategies for small and medium-sized construction companies(SMCCs) in South Korea. The research methodology employs PEST (Political, Economic, Social, and Technological) analysis within the construction industry. Findings suggest increased investment in research and development, adoption of eco-friendly technologies, and localization strategies. By enhancing competitiveness through advanced technology adoption and strengthening sustainable practices aligned with global standards, firms can mitigate political and economic risks. Policy implications include collaboration with government and relevant agencies to support Official Development Assistance (ODA) projects, provide financial assistance, manage risks, and establish integrated information platforms. Moreover, enhancing capabilities through education and consulting programs in technology, law, finance, and risk management prepares firms for international expansion. This study offers specific solutions to Korean small and medium-sized construction companies, emphasizing enhanced policy support to successfully pursue expansion and growth opportunities in the global market.