The 47-year-old man from the town of Warwick, southwest of Brisbane, is facing 145 charges, including five counts of rape, and making and distributing child pornography.
His alleged crimes occurred between 2002 to 2015 and involved victims from Queensland, NSW and Victoria.
Police will claim the man used social media sites to target children under the age of 16, using the aliases Jazz, Jazzman and David Bourne.
In some cases, he allegedly lured children to hotel rooms where they were sexually assaulted.
Other victims were offered money to send indecent photos of themselves and in some cases the man resorted to extortion to obtain those images, police will allege.
Officers have also said other victims as far away as Western Australia may surface.
The man was not present when his case was mentioned in the Warwick Magistrates Court on Monday. He was remanded in custody with the case to return to court on July 20.
He was charged after a joint investigation by child protection officers in Warwick and Queensland's Taskforce Argos, which targets online sex predators.
Speaking outside the court, the man's lawyer, Sarah Gordon, said the July court date would give police the time they needed to prepare a brief of evidence.
"We've just received the charges, so there's really not much I can say," Ms Gordon told reporters.
"We haven't had a chance to formally talk to the client about that yet."
Ms Gordon was reluctant to say how the man was coping after being charged.
"I'm really not able to say much more," she said.
The charges include:
- five counts of rape
- four counts of indecent treatment of children under 16
- eight counts of grooming child under 16 with intent to procure engagement in a sexual act
- 20 counts of involving children in making child exploitation material
- 11 counts of making child exploitation material
- two counts of making a child abuse film
- one count of distributing child exploitation material
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