The decision came after the far-right party held an extraordinary general meeting at a secret location in Essex, a party spokesman said.
It was arranged after the Central London County Court told the BNP to amend its constitution to comply with race relations laws or face legal action by the Equality and Human Rights Commission.
Party leader Nick Griffin told Sky News he expected a "trickle, rather than a flood" of applications from black and Asian people.
He said: "Anyone can be a member of this party. We are happy to accept anyone as a member providing they agree with us that this country should remain fundamentally British."
The party's democratic credentials were questioned by a BBC reporter who told Mr Griffin he had seen a journalist being "bundled out" of the meeting.
The BNP leader said the Times newspaper, where the reporter works, had lied about the party.
He said: "Because he is from The Times, which is owned by Rupert Murdoch, and it lies and it lies and it lies about this party. So he was told 'we're sorry, you told one lie too many', the Times, so we are not allowing anyone from the Times in - kindly leave. He refused to leave when he was asked so he had to be encouraged to leave."
The BBC reporter asked if he would be removed if he said the wrong thing. Mr Griffin replied: "If you utter some outrageous lie about me... you won't be welcome again."
A spokesman for News International confirmed one of their reporters had been removed from the meeting.
icsolihull
What we really like is the fact that the BNP had this pretense. As if they had a choice ! ! !
