Background. The postpartum period is an important transitional time for couples to put the decision on family planning utilization. However, women in Ethiopia are usually uncertain about the use of family planning during this period. This cross-sectional study was, therefore, aimed at determining the intention of modern contraceptive use and associated factors among postpartum women attending the immunization clinic in Sodo town, Ethiopia. Method. This institution-based cross-sectional study was conducted among 416 study participants from May 25 to June 20, 2019. The data were collected by using a systematic random sampling technique of interviewer-administered questionnaires. Descriptive analysis was done, and results were presented in texts and tables. Variables at bivariate analysis with a p value < 0.2 were moved to the multivariate logistic regression model to control potential confounding variables. Statistical tests at p value < 0.05 during multivariate analysis were considered as a cutoff point to determine statistical significance. Results. A total of 416 postpartum women participated in the study yielding a response rate of 98.1%. The prevalence of intention on modern contraceptive use among study participants was 70%. The odds of intention on modern contraceptive use was higher among study participants who had secondary school education (AOR=2.052, 95% CI: 1.064-3.958), antenatal care visit (AOR=1.74; 95% CI: 1.02-2.95), knowledge on modern contraceptive use (AOR=2.54; 95% CI: 1.50-4.28), menses resumption (AOR=2.05; 95% CI: 1.14-3.68), and husband approval to use contraceptives (AOR=2.395, 95% CI: 1.501-5.458). Conclusion. The intention of modern contraceptive use among postpartum women was low. Family planning providers should emphasize reducing barriers of intention like lack of education, knowledge, male partner approval, antenatal care visit, and advise the impact of menses on fertility.