This study examined E-Learning-based sociolinguistic instruction's effectiveness of EFL university students' sociolinguistic competence. This study applied a quasi-experimental method with the Non-Equivalent Control Group Design. The participants of this study were 76 students purposefully recruited from a University in Malang, Indonesia. They were English Education majors and took the sociolinguistics course. The data were collected by a sociolinguistics test to measure the participants' sociolinguistic competence and analyzed using the independent sample t-test and Normalize Gain. The findings showed that the sociolinguistics competence from groups of students who had learned through e-learning based on sociolinguistics instruction differs significantly from groups of students who had learned through face to face. The findings also showed that the experimental group was better in their post-test scores than the control group. The use of e-learning-based Sociolinguistic instruction contributed to developing EFL University Students' Sociolinguistic competence.