It's easy. Wednesday and Thursday Saturday Sunday games are sportsnet and Monday Tuesday Friday games are tsn
Wrong!!! Wednesday, Saturday, and Sunday will be Sportsnet because those are their guaranteed national games. The other nights could be either SN or TSN. They will be usually be regional games, although I think that SN may have a few Leaf games each year that are national games on those days.
Here's some quick examples that prove you were wrong:
Monday, January 22 was a SN regional game. (You said Mondays were TSN)
Tuesday, February 20 will be a SN regional game. (You said Tuesdays are TSN)
Thursday, February 22 will be a TSN regional game (You said Thursdays are SN)
I will kind of give you Fridays as TSN as all but one of the five Friday night Leaf games this year aired (or will air) on TSN. The one exception was during the WJC.