After publishing my manuscript, can I withdraw the manuscript and publish it at a different journal?
The question is: is this possible? 


If you have signed over the copyright of your paper to this journal, or given them an irrevocable license to distribute, then they don't have to take down the paper just because you have asked them. In fact, if they are a reputable journal and the paper has already been published, they shouldn't just take down the paper without a very good reason, because that would distort the scientific record.


  and what is consequences for submitting the same manuscript to another journal?


Submitting a manuscript to a journal that is already published in another journal is called "duplicate publication", and it is considered a kind of research misconduct. Consequences can include retraction of the duplicate publication, being banned from submitting papers to that journal for some period of time, or being banned from submitting papers to that publisher's journals for some period of time.