This study aims to analyze the effects of sales promotion and store atmosphere on hedonic shopping motivation and impulse buying among customers of Indomaret, Lippo Karawaci, Tangerang. The target population in this study was all students and alumni of Uuniversitas Pelita Harapan who had visited Indomaret in Lippo Karawaci, with a sample size of 150 respondents. The data was collected using a questionnaire and analyzed using Partial Least Square – Structual Equation Modeling (PLS-SEM) in SmartPLS ver. 3.3.3 program. The results show that the sales promotion has a positive effect on hedonic shopping motivation and impulse buying; the store atmosphere has a positive effect on hedonic shopping motivation but has no effect on the impulse buying; and the hedonic shopping motivation has a positive effect on impulse buying. Thus, the sales promotion plays an important role in increasing the impulse buying.