Introduction: Sacroiliac dysfunction is major pain syndrome in pregnancy. It is caused by specific structure and function of the sacroiliac joints and their adjustment during pregnancy. ----- Aim: To establish the effectiveness of exercise in pregnancy on reducing sacroiliac dysfunction. ----- Materials and methods: Randomised controlled trial has been undertaken in the line of inclusion and exclusion criteria. Study group has conducted four different exercises used in order to stabilize the pelvis performed twice weekly for 20 minutes. The control group was complied with their normal lifestyle. Visual Analog Scale was used to assess the pain intensity while Quebec scale was used for assessment of the degree of disability in everyday activities. ----- Results: Analysis is based on 408 pregnant women included (207 in the study and 201 in control group). Statistical significance was found (p<0.001) in reduction of pain intensity with significantly reduced disability in study group (p<0.001).The results showed a strong positive correlation between decreased/increased pain intensity and degree of disability in the study/control group. ----- Conclusion: Our results supports effectiveness of exercise used in order to stabilize the sacroiliac joints during pregnancy, pointing importance of exercise in management of SID during pregnancy.