One of the most easiest methods to make the player sprite collide into sprite 2 or higher is by using a simple hardware collision. This is triggered by using $D01E. Unfortunately with most games these days, $D01E is very useless, therefore a software collision is used. Anyway, if you wish to use a sprite/sprite collision using hardware pokes, then here is how it works.
LDA $D01E ;Read hardware sprite/sprite collision LSR ; (LSR A for TASM users) Collision for sprite 1 BCC HIT RTS ;No collision HIT INC $D020 JMP HIT
This source above shows that if the very first sprite hits any other sprite, the border will flash
If you want the next sprite to read hardware collision to other sprites just add another LSR, etc.