The product has been on sale from January 2020 to November 2025 and only batch 20/25 from Vietnam is affected, the employee said.
Customers are advised to email or call Kmart them if they are unable to return the product or have sold or gifted it to another person.
The news comes a week after Kmart recalled coloured sand products over concerns they could be contaminated with asbestos.
The retailer has since withdrawn all sand-based toys from sale as a precaution.
A recall has been issued for 380g pots of craft sand that come in 15 different colours. Photo / Product Safety
It said there was a low risk that any asbestos found would be airborne or fine enough for inhalation.
The sand is part of a recall that expanded further on Thursday. The latest contaminated item added to the list is 380g pots of craft sand in 15 different colours.
Samples of the product, which are sold in dozens of cut-price retailers and dollar stores, have tested positive for asbestos.
The Ministry of Business, Innovation and Employment (MBIE) and other agencies are also testing samples from other similar products available in New Zealand.
Testing of other play sands in New Zealand is ongoing, MBIE said.
Tom Eley is a multimedia journalist at the Waikato Herald. He previously worked for the Weekend Sun and Sunlive.