French Foreign Minister Bernard Kouchner proposed holding the conference during his visit to Sudan, offering Paris as a venue and setting a tentative date of June 25.
"The Sudanese side notified the French Foreign Ministry about its refusal [to participate in] the conference," the Sudanese Foreign Ministry said, adding that France had not consulted Khartoum on the matter.
It also said such a conference could have a reverse effect to the one intended, further dividing the parties concerned.
Last Tuesday, Khartoum agreed to a peacekeeping operation in Darfur, to be run jointly by the UN and the African Union, which provides the deployment of 23,000 foreign troops in the province.
In March 2007, the UN mission accused Sudan's government of orchestrating and taking part in "gross violations" in Darfur and called for urgent international action to protect civilians.
The UN estimates inter-ethnic violence and disease have left 450,000 dead since the latest conflict began in February 2003, mostly among ethnic farming tribes from which rebel groups like the Justice and Equality Movement and the Sudan Liberation Movement fighting the central government in Khartoum draw their numbers.
The Janjaweed militias, which the Sudanese government denies supporting but who continue indiscriminate attacks against civilians, are mostly nomadic Arabs and have been in conflict with farmers over land.
The U.S. government recently described the situation in Darfur as "genocide."
