you should write it yourself , because there is no general SOP for business course students or engineering courses or whichever ,the people at the embassy need to feel the genuineness of your SOP , it will be different for everyone , bcoz of our goals , future plans , what we studied , work experience and other things ,
so better to write one urself from your heart.
You can refer to many SOPs available online to get a general idea of the pattern.