I am a permanent resident of Australia. Can I apply for my son to come to Australia?

Yes, it's definitely no problem to get a tourist visa in Australia. However, if you are an immigrant, the conditions you need to meet are generally: 1 minor under one year of age. 18 can immigrate directly with their parents; 2./kloc-children aged 0/8-25 must have no independent financial ability. For example, children are still at school, or they are physically inconvenient to work. Other times will be more difficult.