Mr McGowan said he would consider banning travellers until the coronavirus vaccine was fully rolled out after NSW recorded another 27 cases of the virus on Wednesday.
The outbreak that began on June 16 with an airport limousine driver has reached 182 cases and prompted a three-week lockdown of Sydney.
WA Premier Mark McGowan (pictured) said unless NSW eliminates their current outbreak he would consider a permanent hard border with the state until sufficient people are vaccinated
'Until we have high levels of vaccination we should not support a model whereby the virus is permanently allowed to spread,' he said.
Only seven per cent of Australians are fully vaccinated and authorities are struggling to source sufficient supplies of the Pfizer vaccine.
Mr McGowan said WA would only reopen the border with NSW if authorities in the state suppressed the virus in the same way as Victoria did during its deadly second wave last year.
Victoria endured an ultra-strict lockdown eventually lasting four months to suppress the outbreak - which claimed 768 lives and reached 6,768 active cases.
'NSW needs to do what