It's a bit tricky putting a multiple choice before als or dan are introduced in isolation.
Can you not say Ik ga dan jij gaat.. as in I go than you go. I had to choose between als and dan and I was wandering if they both could possibly fit into this sentence
No, that doesn't really work. You can say "Ik ga, dan ga jij" (I go, then you go).
Also note that "als" en "dan" mean quite different things. However, they can be combined into the conditional structure "als .... dan ...." (if ... then ...).
But, if I'm not wrong, even if you had writen correctly, it'd not be acceptable. The correct form for it would be "ik ga, dan gaat jij". At least, it's what I guess.
Note that "als" is a subordinating conjunction, but "dan" is not. So after "als" your word order needs to put the verb at the end of the clause, whereas after "dan" you use V2 word order in a main clause:
ik ga als jij gaat
ik ga dan ga jij
Note also that since the verb precedes "jij" here, it has a clipped rather than a full ending.