A Queensland man has died while quad-biking through a Sunshine Coast forest, two weeks before his wife is due to give birth to their first child.

Paramedics were called to Beerburrum State Forest on Friday after Matthew Hall became sick while riding in the hot conditions.

A Queensland Police Service spokeswoman said the Virgin Australia pilot stopped for a "breather" about 2:00pm while his friend rode ahead.

"When he came back he [the friend] located the deceased lying on the ground," she said.

"At that stage he was still conscious and breathing."

The friend called an ambulance and attempted to cool Mr Hall down by pouring water on him.

However, the spokeswoman said the 30-year-old "took a turn for the worse" and died at the scene.

Paramedics attempted CPR but were unable to revive him.

Seven News reported Mr Hall's body temperature climbed to 42 degrees Celsius in the lead-up to his death, which caused his organs to shut down.

On Instagram, wife Emily Hall said her husband died of dehydration and exhaustion.

"He was my best friend and my soul mate," she wrote of her high school sweetheart.

"I can't fathom doing life without him but my strength is knowing he will live through his son.

"I will love him enough for the two of us and I will make sure I do Matt proud and be the best mum to him.

"I love you [Matt] with all of my heart and all of my soul and I'll miss you every single day."

A report will now be prepared for the coroner.

ABC/AAP