Yes! Orders that are entered outside market hours will be held in a queue until normal trading commences (click here for more information on the ASX trading hours).
Only 'limit' orders can be placed outside of market hours. 'Market' orders are not available outside of trading hours, including the pre-open and auction phases of the market (click here for more information on the difference between 'at-limit' and 'at-market' orders).
Please note: all market integrity rules still apply to orders placed outside market hours.