Christianity Solidarity Worldwide has said the committee, which has been ruled as illegal by Sudanese courts, has already sold off some of the Sudanese Evangelical Presbyterian Church's property to Muslim businessman and intends to continue doing so until none is left.
The government department responsible for religious affairs has refused to recognise the Sudanese Evangelical Presbyterian Church's (SEPC) own building committee as the legitimate overseer of its land and property, recognising the now illegal committee instead.
This illegal group has recently elected new members and extended the appointment of other members. This is significant because if the government department responsible for Sudanese religious affairs recognises these new elections and extensions, it would nullify the Sudanese courts' previous ruling that it is illegal.
Seventeen people from the SEPC have been arrested and released in relation to its building and land confiscation, and separately six clergymen and two lay members from various in Sudan have also been arrested by Sudanese since December 2015.
Mervyn Thomas, Chief Executive of Christian Solidarity Worldwide (CSW), said: "We are concerned to learn of the appointment of yet another committee, in violation of church procedures and the court ruling.
"This development appears to be part of an ongoing effort aimed not only at seizing property belonging to the SEPC, but also at closing it down completely.
"We urge the Minister of Guidance and Endowments, Dr Ammar Mirghani Hussein Mohammed, to ensure that the ministry complies with the court's decision and recognises the legitimacy of the [SEPC] committee."