A Sydney aged care home that made headlines after a worker was allegedly filmed assaulting an elderly resident has been sanctioned by the Health Department.

The Health Department has sanctioned a Sydney aged care home after an audit found there was a "severe and immediate" risk to the health, safety or well-being of its residents.

Bupa Seaforth, which made headlines in September after one of its workers allegedly assaulted an 82-year-old resident with a shoe, failed to meet more than 30 of 44 outcomes in a recent audit.

In particular, the department noted it had "serious concerns" in relation to staffing, health and pain medication management and behavioural management at the northern beaches facility.

The home will not receive Commonwealth funding for new residents and will have to undergo a six-month improvement schedule under the sanctions.

Federal Aged Care Minister Ken Wyatt says he has been closely monitoring reports and was increasingly aware of the rising number of concerns in the aged care sector.

"All incidents of aged care failures are of the utmost concern," he said in a statement to AAP.

"Despite wide-ranging and continuing reforms ... there continue to be significant incidents of completely unacceptable, sub-standard care, which must be addressed."

Mr Wyatt said the upcoming royal commission into the aged care sector would work to determine what needed to be done in the future to ensure care standards are met.

Bupa apologised "unreservedly" to the residents of the Seaforth home and their families on Wednesday.

"We sometimes fail to live up to the high standards we set, and we are committed to addressing this," a spokesperson said in a statement.

"We make it our priority to provide a safe and supportive environment for our residents and we accept the department's findings that in this case there have been failings.

"We are working with the department to address the issues in their report."