You need a visa for Uganda if you have a Sri Lankan passport

This visa is for travellers visiting Uganda, Rwanda, and Kenya for business or tourism during one trip. Travellers can travel freely between these three countries, entering and exiting each country multiple times. Travellers visiting Kenya must also obtain a Kenyan Electronic travel authorization. Travellers must start their trip in Uganda. The visa becomes invalid if travelling outside of these countries. An eVisa is the fastest and easiest way of obtaining a visa as you can submit an application and supporting documents online. If approved, travellers receive their eVisa confirmation electronically. When travellers arrive at immigration they will be asked for their passport and eVisa to ensure they have proper documentation.