The new restrictions take effect at 00:01 on 31 December, while other areas will move from Tier 2 into Tier 3 at the same time.
It follows a number of areas being placed in Tier 4 on 20 December.
"We understand the latest Government announcements will come as a further setback to everyone in the game. However, with infection rates on the rise, we must all observe the latest measures to reduce the spread of Covid-19.
"We will continue to seek further guidance from the Government in relation to our planned restart to Junior National League competitions and we will update everyone in the basketball community early in the New Year."
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