That's according to SIPTU which represents the SNA's.
The precise date of when they are being let go is unknown. Some have already lost their jobs, and it had been expected that the rest would go at the end of last week, but the union now believes
the date has been pushed back to March.
The union has called for the cuts not to be made until the end of the school year to avoid disruption to the children involved.
John Hubbard explained that the estimated 100 are amongst 1,200 who will be let go nationally. The move will see approximately 10% of all SNA's disappearing from schools.
And other SNA's have seen their hours cut drastically.
"As it stands right now, there's an assessment by the National Council for Special Needs Education going on since last March," he explained, adding that the move followed on from recommendations included in economist Colm McCarthy's An Bord Snip report.
"It's a widespread cull," Mr. Hubbard explained, although he added that the Department of Education disputed this, claiming that they were just implementing the eligibility rules.
He said the union was also calling for the SNA's who lose their positions to be put on regional panels so that they can slot back into work as needed.
"Instead they're making them redundant, making them unemployed," he explained.
And he predicted widespread disruption as a result of the move.
"In some cases the remaining SNA's will have to take up the slack and in some cases, there will be no SNA's.
"And the needs of the children will simply not be met," he told the Leinster Leader.
"The majority of schools have SNA's, and they're all going to lose some."
One local principal, Gerry O'Donoghue of Athgarvan National School told the Leinster Leader that losing an SNA would present a "doomsday scenario" to the affected children.
The school has two SNA's and was lucky, under the review, to hang onto them for the coming year at least.
Mr. O'Donoghue explained that the SNA's take care of the needs of their client children who have either a physical or intellectual disability.
"It would be a huge loss to the child if they were removed. In some cases they wouldn't be mobile without the SNA. It would be a doomsday scenario for them.
He explained that the criteria under which a school could have an SNA was very narrow, even when the scheme was set up.
"And under this review, it's even narrower," he said. But he was clear that it was merely a "cost cutting mechanism".
"They started out with a quota and they're just looking at the softest targets."
And two local county councillors have slammed the move, saying it "challenges the notion that education has been exempted from recent budgetary cutbacks as was claimed by the Green Party".
