The NSW Teachers Federation's state executive is meeting on Tuesday to consider the matter after striking last year before suspending action to negotiate with the government.
It says Premier Dominic Perrottet has failed to make progress with the union on the issue of teacher shortages.
The union says the premier squandered opportunities to engage in genuine negotiations throughout Term One.
The union wants the government to address a lack of teachers, and what it says is the underlying cause - uncompetitive salaries and crippling workloads.
It comes after the NSW Teachers Federation made the decision during its February State Council meeting to suspend its industrial campaign.
The decision was made in good faith that the premier would engage with their concerns.
"The premier refused to embrace that opportunity and, as a result, he has failed students, their parents and the teaching profession," the union said in a statement.
A special meeting of the Federation's State Executive is being held on Tuesday morning.
Union membership was asked to "ready itself" ahead of the meeting by NSW Teachers Federation President Angelo Gavrielatos.
NSW teachers went on a state-wide strike in November, walking off the job in defiance of a ruling by the state's industrial commission.
The premier said he was disappointed by the strike action, saying the government's offer of a 2.5 per cent pay rise was "fair and reasonable".
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