Can we move data from SQL Server to Oracle Server?

Of course you can. How you perform this depends on your requirements. Since you have SQL Server, you can use Data Transformation Services (DTS) to move data from SQL Server to Oracle connecting to the Oracle database through ODBC drivers. If this move will be required on a regular basis, then you can save your DTS routine as a DTS package and optionally schedule the DTS package to run regularly. DTS has tons of features so it can handle most of your needs.

If you need "real-time" access to SQL Server data from within Oracle, then look at implementing Oracle's Heterogeneous Services (HS). With HS, you can have an Oracle connect to SQL Server through ODBC and query the data through a database link.