Background: The promotion of local healthcare planning is crucial to assist public health nurses in improving community health inequities. However, there is no effective educational program for developing relevant skills and knowledge among these nurses. Therefore, this study aims to assess the feasibility and acceptability of a newly developed web-based self-learning program, designed to promote the involvement of public health nurses in the local healthcare planning process. Methods: This pilot randomized control trial will randomly allocate eligible public health nurses to intervention and control wait-list groups [1:1]. The intervention group will be exposed to six web-based learning modules from July to October 2021. After collecting post-test data, the wait-list group will be exposed to the same modules to ensure learning equity. We will then evaluate the primary outcomes by implementing a validated and standardized scale designed to measure public health policy competencies both at baseline and post-intervention, while secondary outcomes will be measured on an action scale to demonstrate the necessity of healthcare activities. The third outcome will be knowledge and skills related to local healthcare planning by public health nurses. Participants will also provide feedback on both trial feasibility and the web-based self-learning program itself, which will help us identify improvement points for continual refinement. Feedback will be given through free descriptions. Discussion: This pilot study will assess the feasibility and preliminary effects of a web-based self-learning program designed to develop the competencies of public health nurses involved in local healthcare planning. We will examine all outcome scales and data collection procedures in preparation for a future definitive randomized controlled trial. This will provide preliminary data for an intervention aimed at improving relevant competencies among public health nurses who are tasked with resolving health inequities in their respective communities through local health planning. Trial registration: The protocol for this study was registered with the University Hospital Medical Information Network Clinical Trials Registry and approved by the International Committee of Medical Journal Editors (No. UMIN000043628, March 23, 2021).