From looking at TV listings on sportsnet.ca:
Saturday March 19 – 1:00 PM: Toronto at Philadelphia (SNE, SNO, SNP)
Sunday March 20 – 1:00 PM: Pittsburgh at Toronto (SN)
Monday March 21 – 1:00 PM: Toronto at Detroit (SN1)
Tuesday March 22 – 1:00 PM: NY Yankees at Toronto (SN)
Wednesday March 23 – 1:00 PM: Toronto at Philadelphia (SN)
Thursday March 24 – 1:00 PM: Atlanta at Toronto (SN)
Friday March 25 – 1:00 PM: Toronto at Detroit (SN)
Saturday March 26 – 1:00 PM: Toronto at NY Yankees (SN)
Sunday March 27 – 1:00 PM: Philadelphia at Toronto (SN)
Monday March 28 – 1:00 PM Toronto at Atlanta (SN)
Thursday March 31 – 1:00 PM: Detroit at Toronto (SN)
Saturday April 2 – 1:00 PM: Philadelphia at Toronto (SN)
Sunday April 3 – 1:00 PM: NY Yankees at Toronto (SN)
Monday April 4 – 1:00 PM: Toronto at Detroit (SN)
Games not broadcast:
March 18: Toronto at Baltimore
March 30: Toronto at NY Yankees
April 1: Toronto at Pittsburgh
April 5: Baltimore at Toronto
I think spring training broadcasts are produced by the home team. If so, then all Toronto home games will be produced by Sportsnet. The away games would be the other team's broadcast. I am not 100 % sure on that.
The March 30 game against the Yankees (6:35 pm) and the April 1 game against the Pirates are being broadcast by Yes and AT&T Pittsburgh, respectively, so it's possible that they may be available up here in some way.
The April 5 game is a curiosity. It is the only Jays home game not on the broadcast schedule. Perahaps Sportanet has simply not reached April 5 when adding content to the web site (although after March 27, Jays games are the only thing shown in the TV listings). I think it's highly likely that this game ends up being broadcast.
I should note tha the Jays home games are only shown on the visual version of the TV listings and are not shown in the grid version of the listings. Nor have the Rogers Ignite TV listings been updated to include them.
Of course, given that the spring training schedule has been available for less than a week, broadcast schedules are quite likely still a work in progress.
So, it looks like almost every game will be available this year.