This study aimed to develop an innovative software to help teacher trainees learn to write Tamil lesson plans more effectively. The researcher administered diagnostic tests and found that teacher trainees struggled with writing Tamil lesson plans using conventional methods. An experimental study was conducted comparing a control group that learned using traditional methods to an experimental group that used the new software. Results showed that while the control group did not significantly improve from pre-to post-test, the experimental group saw a significant gain in scores after using the innovative software. Therefore, the study concluded that the new software was more effective than conventional methods for teaching teacher trainees how to write Tamil lesson plans.