There needs to be a mix of solutions to help with the transport. Sandhills is just too small to cope with the demand. I dont think even if you make it bigger it solves the problem.
I think they should look at adding a new station along that line. There is a patch of land between the trainline, Great Howard Street and Sherwood Street and the Leeds Liverpool Canal. They could build a station here (Circled in red). So that all of the people coming to the stadium from the town centre would get off here. Then Sandhills is only used for people coming from the north of the city. Then after the game people going back to the city centre go from the new station and people heading North go to Sandhills. It cuts the train issue in half.
The area circled in blue could have a "fan plaza" like Sandhills and also have a drop off and pick up point for the "gliders"
In terms of cost its probably in the £15m to £20m range, given that Ormskirk station was £13m, but it was 10 years ago.
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I also think they need longer trains. There are not enough carriages for people and I think there should be a ferry terminal at the back of the stadium and bars within the stadium should be open for 1 hour after the game. All of these things together will improve the experience of getting to and from the stadium