Yes! Orders that are entered outside market hours will sit in a queue until such time as the market opens.
Read more on the ASX trading hours.
Only 'limit' orders can be placed outside of market hours.
'Market' orders are not available outside of trading hours, this includes the pre-open and auction phases of the market. All market integrity rules still apply on orders placed outside market hours.
Read more on the difference between 'market' and 'limit' orders.