The cable you need is frequently called “Toro signal cable”. Most irrigation supply stores (not the big boxes) can get it for you by the foot.
Paige P7162D (SiteOne’s part no. 180096TH), 16AWG 2-conductor plus drain, shielded
Toro Communication Cable 7162D (SiteOne’s part no. 162STR), 16AWG 2-conductor
should be available somewhere in Canada. Contact the superintendent at your nearest golf course for some help. Just don’t use thermostat wire or anything else non-buriable.