Defence Minister Pranab Mukherjee and External Affairs Minister K Natwar Singh will represent India at Sri Lankan Foreign Minister Lakshman Kadirgamar's funeral in Colombo on Monday.
The high-level delegation will also include Foreign Secretary Shyam Saran and other senior officials, an external affairs ministry spokesman said.
The delegation will leave for Sri Lanka on Monday morning, he said.
Earlier, India strongly condemned Kadirgamar's assassination, describing it as a "heinous act" of terrorism by those seeking to undermine the Island nation's unity and political stability.
Maintaining that India's support for unity and territorial integrity of Sri Lanka remained "constant and undiluted", the spokesman said New Delhi will always extend its full support to the friendly neighbour in its hour of need.