Partner referral (or contact tracing) is an essential approach for preventing sexually transmitted infections. Even though this approach has been used in Ethiopia, there is a scarcity of evidence in Ethiopia particularly in this study area. A cross-sectional study was conducted among 397 patients with curable sexually transmitted diseases. Factors associated to the practice of sexual partner referral were explored where variables having a p-value of <0.05 in multivariable analysis were considered statistically significant. Referrals for sexual partners were found to be 42.4% in this study (95% CI: 35.3, 45.3). Not expecting the end of the relationship among regular partnerships (AOR: 4.8; 95% CI: 1.9, 12.4), perceived risk of reinfection (AOR: 3.0; 95% CI: 1.8, 5.3), perceived self-efficacy (AOR: 3.8; 95% CI: 2.4, 6.3), intention to refer partners (AOR: 3.7; 95% CI: 2.0, 6.4), and knowledge of sexually transmitted infections (AOR: 3.0; 95% CI: 1.8, 5.0) were significantly associated with sexual partner referral. This study showed that sexual partner referral was low. Perceived risks of reinfection, perceived self-efficacy, anticipating the end of a relationship, intention to refer partners, and knowledge of sexually transmitted infections were significant predictors of sexual partner referral. Intervention endeavors need to consider factors pointed out in this study to improve sexual partner referral.