Basil Rajapaksa is the minister of economic development and the key political advisor to his brother. Basil is expected to meet External Affairs Minister Salman Kurshid and National Security Advisor Shivashankar Menon.
The visit comes ahead of the government plans to dilute powers of the provincial councils - a system enshrined in the Sri Lankan constitution in 1987 as a result of Indian intervention in the country's ethnic conflict with the minority Tamils.
"What he will do is inform India what we are going to do with the 13th Amendment. As a government, we have decided that it requires certain amendments, or changes to suit the present time. A Constitution is not cast in stone. It can be changed from time to time."
Asked if the government meant reducing police and land powers from provincial councils, the minister said: "Some may say it is an increase of powers while others may argue otherwise. Although the 13th amendment gave police and land powers to provincial councils, these powers were never exercised by them because the power was not given to them.