The strong comments by the Ministry of External Affairs (MEA) came days after the UK turned down India's request to not allow the rally to take place.
"We have said that it seeks to propagate violence, secessionism and hatred and we expect them to take into account the larger perspective of the relationship when they take a decision on such matters," Kumar said during a media briefing.
After receiving information about plans to hold similar events in certain other places in Europe and elsewhere, the MEA has written to Indian missions in those countries to take up the issue with local governments.
"We are aware that something similar is planned in some other locations as well. We have written to our mission to take it up with foreign offices of respective countries," said Kumar.
Sikhs for Justice (SFJ) says the rally is intended to raise awareness for a non-binding referendum in 2020, calling for the Sikh-majority state of Punjab to be granted independence. The SFJ calls itself an advocacy group.
Asked about certain Bollywood and sports personalities saying they would seek government's advice on visiting Pakistan to attend Imran Khan's swearing-in ceremony, Kumar said the government has not got any communication, adding if approached it will give its view.
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