Post-primary pupils will be required to wear face coverings in the classroom, it is understood.
The BBC reported that the change was outlined in a letter from the Department of Education to schools.
Teachers and post-primary students are already required to wear a face covering in communal areas of the school, such as corridors.
According to the BBC the letter was issued to schools yesterday.
Schools were due to reopen on Monday January 4 but yesterday Education Minister Peter Weir announced a one-week delay with primary and post-primary schools to deliver remote learning for the first week of the new term. The decision was made due to spiralling Covid-19 cases.
For secondary school Years 8 to 11, remote learning will continue throughout January.
Schools will open next week to accommodate vulnerable children and those of key workers.
Read more:Schools braced for further upheaval should Covid cases continue to spiral