I have a diploma in Marketing Management from outside the US. Can I study for the accelarated BSN program without being physically present in the US?
Sure, you can. If you are a Untied States citizen, you can get admission in any of the online programs while being not physically present in the country. That is one of the benefits of online education. Also, it does not matter which area of specialization your diploma program is since undergrad programs start from the scratch.