Teachers use a Learning Module to create their learning designs, emphasizing the activities they select with knowledge-based processes. This paper aims to develop a TPACK-based teacher's module that provides detailed instruction in the planning for the teaching-learning process, giving more focus on the teacher's ability to maneuver, navigate, and integrate technology in their Geometry classes. The development of the module used the ADDIE model: analysis, design and development, implementation, and evaluation. Experts validated the module's initial draft, and it was revalidated in a workshop by mathematics and education experts. The developed TPACK-based teacher's module gains an overall very high acceptability rating (M=3.52, SD=0.54), especially on the 3 dimensions: objectives, format and language, and usefulness of the module. Comments and suggestions were incorporated, and when it was implemented in a classroom, it was found to have high usability to teachers (M=3.92, SD=0.46).