Conservative Anglicans meeting in Jerusalem will create a global network to combat modern trends in the Church like the ordination of gay clergy.
The group has also decided to break its relationship with the liberal wings of the US and Canadian Churches.
It will operate independently of the Archbishop of Canterbury, but will stay inside the Anglican Communion.
The traditionalists say they are fighting a "false Gospel" and the rift in the Church cannot be patched up.
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Network of allies
The plan is expected to be adopted on Sunday, the final day of the Global Anglican Future Conference (Gafcon), where 11,000 traditionalists - many from developing countries - have been meeting in Jerusalem.
The group said it would stay inside the Anglican Communion, but with its own statement of theology and council of archbishops.
"A major realignment has occurred and will continue to unfold," the group said in an official statement.
BBC religious affairs correspondent Robert Pigott says the existence of a separate shadow Communion is likely to have a profound impact on Anglican churches all over the world - providing disgruntled traditionalists with a powerful network of allies overseas.
The move underlines the alliance's independence from the Archbishop of Canterbury, Rowan Williams, and makes clear that it will no longer recognise Dr Williams' traditional role as the leader of the world's Anglicans.
Conservatives at the Jerusalem event repeatedly criticised Dr Williams for failing to fully discipline the US Episcopal Church.
Long-standing divisions over how Anglicans should interpret the Bible have been widening steadily ever since the Episcopal Church consecrated the first openly gay bishop, Gene Robinson, in 2003.
(BBC)
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