I don’t know your age but I expect you’re a bit older! This has changed dramatically in the past 20-30 years and has been a contentious issue for the past few in the computer science education community. Many programs, if they even offer numerical analysis coursework, provide it to supplement regular analysis coursework (rather than computer science coursework).
Do you have any more context on the contentiousness of including numerical analysis in a traditional cs curriculum? I’m curious to know what the arguments are on both sides.
I’ve also recently noticed that programs and students outside North America seem to take the content much more seriously.
I do know that this course is still offered widely across the US, but maybe not within CS, and maybe not as a mandatory course.
But, bottom line: if you're interested, it's very likely you can take it - you may have to check your school of engineering or applied math department.