proc import datafile="J:\excelfiles\sin.xls" out=sasdata dbms=xls replace;
    sheet='Лист1';
    run;

Requested Sheet Name not found on Excel -> J:\excelfiles\sin.xls
Requested Input File Is Invalid
ERROR: Import unsuccessful.  See SAS Log for details.
NOTE: The SAS System stopped processing this step because of errors.
NOTE: PROCEDURE IMPORT used (Total process time):
      real time           0.03 seconds
      cpu time            0.01 seconds

proc import datafile="J:\excelfiles\sin2.xlsx" out=sasdatax dbms=xlsx replace;
sheet='Лист1';
run;