I use the same pack and to carry a net I usually shove it in my wading belt if wearing full waders, or inside the waistband of my waist high waders. Both work decently well when using the Waterdance as a sling pack. Otherwise the pack itself doesn't have a means of carrying a net short of clipping it to one of the D rings the shoulder strap attaches to.
Brian
"My father was very sure about certain matters pertaining to the universe. To him, all good things - trout as well as eternal salvation - come by grace and grace comes by art and art does not come easy." Norman Maclean, A River Runs Through It