I did this AMA a while ago. Perhaps some of the information in it will be helpful to you. As noted, you WILL need a masters degree, and entrance to these programs is competitive.
You can major in special education as an undergrad and take the required courses for speech language pathology grad school applicants as electives. I know a number of people who did this. Their background in special education was very valuable…and would be even more valuable if you chose to work in special education for a couple of years before applying to a speech language pathology masters program.