"The money has already been earmarked, not pledged anymore. Feasibility studies for projects are under way," Arab League Secretary General Amr Musa told a press conference in Nairobi, where he is due to attend Saturday's final phase of southern Sudan peace talks.
"As for the future work in the field of reconstruction, it will have to be coordinated with other donors on one side and the government of Sudan that will be established in accordance with the new (final) agreement.
"We are ready, we will be very active in this, we will participate in all activities to reconstruct the south," he added.
In a bid to end the 21-year conflict, Khartoum and the Sudan People's Liberation Army (SPLA) last week signed three accords on outstanding issues, leaving only details of a ceasefire and implementation modalities.
Hostilities in Sudan erupted in 1983 when the predominantly Christian and animist south revolted against the Khartoum government and formed the SPLA.
The conflict, coupled with recurrent famine and disease, has killed at least 1.5 million people and displaced four million others.