Since an internal path connecting container terminals in Busan New Port in 2017 was opened, it, previously used only in emergencies, was utilized to transfer containers between the terminals during the cargo union strike, receiving positive feedback. Using such internal paths for inter-terminal transport would save costs and time due to reduced travel distance. It can be an efficient alternative, especially for transferring containers to adjacent terminals rather than remote ones. However, there are limited regular cases of using the paths for inter-terminal transport. Research on the reasons for this and solutions in terms of laws, policies, and operations remains sparse. Before a quantitative analysis of using internal paths for inter-terminal transport, a detailed review of legal, policy, and operational aspects is needed. This study identifies various issues hindering the activation of internal path usage for improving inter-terminal transport and derives solutions from legal, policy, and operational perspectives. The study sought to ensure objectivity in its findings by incorporating opinions from various port logistics stakeholders and experts, including terminal operators, shipping companies, transporters, port labor unions, port authorities, industry experts, and academia. The solutions proposed in this study can be seen as prerequisites for utilizing internal paths, and resolving these prerequisites can improve the current inter-terminal container transfers that solely depend on external roads with lower service levels.